Mat Weddle (L) and Bob Johnson listen as Democratic U.S. presidential candidate Bernie Sanders holds a town hall event in Milwaukee, Wisconsin April 2, 2016. REUTERS/Mark Kauzlarich 

Bob Swope discusses canvassing strategy with Fergus Wilson at the Des Moines headquarters of U.S. Democratic presidential candidate Bernie Sanders in Des Moines, Iowa, January 29, 2016. REUTERS/Brian C. Frank 

Bob Anthenat of Dekalb, IL wears a skunk-skin cap as he waits for the start of a town hall hosted by U.S. Democratic presidential candidate Bernie Sanders at Clinton Middle School in Clinton, Iowa December 12, 2015. REUTERS/Mark Kauzlarich 

Director Zack Snyder and Elizabeth Sanders, wife of the late Batman creator Bob Kane, pose after posthumously unveiling the star of Kane on the Hollywood Walk of Fame in Los Angeles, California October 21, 2015. REUTERS/Mario Anzuoni 

San Diego Republican mayoral candidate Kevin Faulconer (R) hugs former San Diego Mayor Jerry Sanders during a rally at his campaign headquarters in San Diego, California February 11, 2014. San Diego voters will elect a new mayor Tuesday to replace disgraced former mayor Bob Filner, who resigned in August after more than a dozen women accused him of sexual harassment and inappropriate behavior. REUTERS/Sandy Huffaker (UNITED STATES - Tags: POLITICS) 

The red jacket for the 1971 season of Captain Kangaroo, the titular character of a long-running children's television series, the keys to his Treasure House, and Bob Keeshan's Emmy award for his role as the character, are pictured in Los Angeles May 17, 2013. Memorabilia from the estate of the series, which ran from 1955 to 1982, will be auctioned off on May 21, 2013 by auctioneer Nate D. Sanders. REUTERS/Fred Prouser
(UNITED STATES - Tags: ENTERTAINMENT) 

Autographed souvenir post cards of Bob Keeshan as Captain Kangaroo, the titular character of a long-running children's television series, and one of his many blonde wigs are pictured in Los Angeles May 17, 2013. Memorabilia from the estate of the series, which ran from 1955 to 1982, will be auctioned off on May 21, 2013 by auctioneer Nate D. Sanders. REUTERS/Fred Prouser
(UNITED STATES - Tags: ENTERTAINMENT) 

Netherlands' team captain Floris Evers (L), Bob de Voogd and Sander de Wijn celebrate scoring a goal against Great Britain during their men's semifinal hockey match at the Riverbank Arena at the London 2012 Olympic Games August 9, 2012. REUTERS/Chris Helgren (BRITAIN - Tags: SPORT OLYMPICS FIELD HOCKEY)

Indianapolis Colts strong safety Bob Sanders (21) and free safety Antoine Bethea (41) break up a pass intended for Houston Texans tight end Owen Daniels (81) in the first half of their NFL football game in Houston September 12, 2010. REUTERS/Richard Carson (UNITED STATES - Tags: SPORT FOOTBALL) 

Indianapolis Colts defensive back Bob Sanders leaves the field after practice at the team's training camp at Anderson University in Anderson, Indiana, August 4, 2010. REUTERS/Brent Smith (UNITED STATES - Tags: SPORT FOOTBALL) 

Indianapolis Colts defensive backs Bob Sanders (21), Antoine Bethea (41) and Kelvin Hayden talk while they leave the field after practice at the team's training camp at Anderson University in Anderson, Indiana, August 4, 2010. REUTERS/Brent Smith (UNITED STATES - Tags: SPORT FOOTBALL) 

San Diego Chargers running back Darren Sproles (L) scores a touchdown past Indianapolis Colts safety Bob Sanders in the second quarter in their AFC Wild Card Round NFL playoff football game in San Diego January 3, 2009. REUTERS/Mike Blake (UNITED STATES) 

Indianapolis Colts defensive back Keiwan Ratliff (31) and teammate Bob Sanders (21) head to the endzone with the game winning interception and touchdown late in the fourth quarter of their NFL football game to defeat the Jacksonville Jaguars 21-24 in Jacksonville, Florida December 18, 2008. REUTERS/Mark Wallheiser (UNITED STATES) 

Indianapolis Colts defensive back Bob Sanders celebrates after intercepting a New England Patriots pass during the fourth quarter of their NFL game in Indianapolis November 2, 2008. REUTERS/Brent Smith (UNITED STATES) 

Indianapolis Colts safety Bob Sanders sits at a news conference where he was named the NFL's Defensive Player of the Year in Phoenix, Arizona, January 31, 2008. REUTERS/Rick Wilking (UNITED STATES) 

Indianapolis Colts safety Bob Sanders sits at a news conference where he was named the NFL's Defensive Player of the Year in Phoenix, Arizona, January 31, 2008. REUTERS/Rick Wilking (UNITED STATES) 

Indianapolis Colts safety Bob Sanders warms-up before their AFC Divisional NFL playoff football game against the San Diego Chargers in Indianapolis , Indiana, January 13, 2008. REUTERS/Brent Smith (UNITED STATES) 

Indianapolis Colts defensive back Bob Sanders (21) tackles Tennessee Titans tight end Bo Scaife during the first quarter of NFL play in Indianapolis December 30, 2007. REUTERS/Brent Smith (UNITED STATES) 

Indianapolis Colts defensive back Bob Sanders puts on his gloves on the bench before an NFL game against the Houston Texans in Indianapolis December 23, 2007. REUTERS/Brent Smith (UNITED STATES) 

Jacksonville Jaguars running back Maurice Jones-Drew (32) runs away from Indianapolis Colts defensive back Bob Sanders during the second quarter of their NFL football game in Indianapolis December 2, 2007. REUTERS/Brent Smith (UNITED STATES) 

Indianapolis Colts linebacker Rocky Boiman (L) celebrates his interception with teammate defensive back Bob Sanders against the Atlanta Falcons in the second half at their NFL football game in Atlanta, Georgia on November 22, 2007. REUTERS/Tami Chappell (UNITED STATES) 

San Diego Chargers Antonio Gates (C) has his touchdown pass broken up by Indianapolis Colts Bob Sanders (L) and Gary Brackett in the endzone during the first quarter of their NFL football game in San Diego November 11, 2007. REUTERS/Mike Blake (UNITED STATES) 

New England Patriots' Wes Welker (L) scores a touchdown as Indianapolis Colts' Bob Sanders dives at him during the second half of their NFL football game in Indianapolis, Indiana on November 4, 2007. REUTERS/Brent Smith (UNITED STATES) 

Indianapolis Colts defensive back Bob Sanders watches his team play against the Tampa Bay Buccaneers during their NFL football game in Indianapolis October 7, 2007. Sanders was injured playing against the Denver Broncos. REUTERS/Brent Smith (UNITED STATES) 

Roger Wehrli, Charlie Sanders, Bruce Matthews, Michael Irvin, Thurman Thomas and Bob Hickerson (L-R) pose with their busts during their acceptance into the Pro Football Hall of Fame in Canton, Ohio August 4, 2007. REUTERS/Ron Kuntz (UNITED STATES) 

Indianapolis Colts' safety Bob Sanders kisses the Vince Lombardi trophy after his team defeated the Chicago Bears to win the NFL's Super Bowl XLI football game in Miami, Florida, February 4, 2007. REUTERS/Mike Blake (UNITED STATES) 

Indianapolis Colts Bob Sanders (C) makes an interception in front of Chicago Bears wide receiver Bernard Berrian (L), as the Colts Cato June defends, during the fourth quarter of the NFL's Super Bowl XLI football game in Miami, Florida, February 4, 2007. REUTERS/Brian Snyder (UNITED STATES) 

Indianapolis Colts Bob Sanders (L) runs with the ball after making an interception against the Chicago Bears as the Colts coach Tony Dungy (R) celebrates during the fourth quarter of the NFL's Super Bowl XLI football game in Miami, Florida, February 4, 2007. REUTERS/Brian Snyder (UNITED STATES) 

Indianapolis Colts Dwight Freeney (93) dives to recover the ball fumbled by Chicago Bears Cedric Benson (32), who was tackled by Colts Bob Sanders (21) in front of Colts Cato June (59) and Bears quarterback Rex Grossman (8), during the first quarter of the NFL's Super Bowl XLI football game in Miami, Florida February 4, 2007. REUTERS/Pierre Ducharme (UNITED STATES) 

Chicago Bears Cedric Benson (32) fumbles as he is hit by Indianapolis Colts Bob Sanders (obscured), while pressured by Colts Dwight Freeney (93) and Colts Cato June (59), during the first quarter of the NFL's Super Bowl XLI football game in Miami, Florida, February 4, 2007. Freeney recoverd the ball on the play.REUTERS/Pierre Ducharme (UNITED STATES) 

Chicago Bears running back Thomas Jones (20) breaks away from Indianapolis Colts defensive back Scott Ware (L), safety Bob Sanders (21) and safety Antoine Bethea (back) during the first quarter of the NFL's Super Bowl XLI football game in Miami, Florida, February 4, 2007. REUTERS/Hans Deryk (UNITED STATES) 

Chicago Bears runningback Cedric Benson (32) fumbles as he is tackled by Indianapolis Colts Bob Sanders in the first quarter of the NFL's Super Bowl XLI football game in Miami, Florida February 4, 2007. REUTERS/Mike Segar (UNITED STATES) 

Chicago Bears' Thomas Jones is tackled by Indianapolis Colts' Nick Harper (L) and Colts' Bob Sanders (back) during the first quarter of the NFL's Super Bowl XLI football game in Miami, Florida, February 4, 2007. REUTERS/Shaun Best (UNITED STATES) 

Indianapolis Colts defenders Antoine Bethea (L) and Bob Sanders leap together after Bethea broke up a pass by the New England Patriots in the fourth quarter of the NFL's AFC Championship football game in Indianapolis January 21, 2007. REUTERS/Mike Segar (UNITED STATES) 

Indianapolis Colts Dan Klecko lifts teammate Bob Sanders (top) after the Colts defeated the New England Patriots in the NFL's AFC Championship football game in Indianapolis January 21, 2007. The Colts will meet the Chicago Bears in Super Bowl XLI in Miami, Florida on February 4. REUTERS/Marc Serota (UNITED STATES) 

Indianapolis Colts Dan Klecko lifts teammate Bob Sanders (top) after the Colts defeated the New England Patriots in the NFL's AFC Championship football game in Indianapolis January 21, 2007. The Colts will meet the Chicago Bears in Super Bowl XLI in Miami, Florida on February 4. REUTERS/Marc Serota (UNITED STATES) 

Baltimore Ravens kicker Matt Stover (R) is congratulated by holder Sam Koch (L) after Stover's field goal in the second quarter of play against the Indianapolis Colts during their AFC Divisional NFL playoff football game in Baltimore, January 13, 2007. At the bottom left is Colts' Bob Sanders. REUTERS/Tim Shaffer (UNITED STATES) 

Kansas City Chiefs Larry Johnson (bottom) is tackled by Indianapolis Colts Bob Sanders during the second quarter of their AFC Wild Card NFL playoff football game in Indianapolis January 6, 2007. REUTERS/Brent Smith (UNITED STATES) 

Tennessee Titans wide receiver Pacman Jones (32) breaks away from Indianapolis Colts cornerback Bob Sanders (21) during the second quarter of their NFL football game in Nashville, Tennessee, December 3, 2006. REUTERS/Matt Sullivan (UNITED STATES) 

New Senators-elect and senior Democratic Party Senators gather for a photo opportunity on Capitol Hill in Washington November 13, 2006, following last week's mid-term Congressional elections. The senators are (L-R) Senator-elect Jim Webb (D-VA), Senator-elect Bernie Sanders (I-VT), Senator-elect Amy Klobuchar (D-MN), Senate Minority leader harry Reid, Senator-elect Jon Tester (D-MT), Senator Charles Schumer, Senator-elect Sherrod Brown (D-OH), Senator-elect Ben Cardin (D-MD), Senator-elect Sheldon Whitehouse (D-RI) and Senator-elect Bob Casey (D-PA). REUTERS/Jason Reed (UNITED STATES) 

AFC New York Jets Ty Law (L) and AFC Indianapolis Colts Bob Sanders (R) take down NFC Carolina Panthers Steve Smith at the NFL football Pro Bowl at Aloha Stadium in Honolulu February 12, 2006. REUTERS/Lucy Pemoni 

AFC New York Jets Ty Law (L) and AFC Indianapolis Colts Bob Sanders (R) take down NFC Carolina Panthers Steve Smith at the NFL football Pro Bowl at Aloha Stadium in Honolulu February 12, 2006. REUTERS/Lucy Pemoni 

Indianapolis Colts defensive back Bob Sanders (21) tackles San Diego Chargers tight end Antonio Gates (85) spinning him in the air during the second quarter of NFL play at the RCA Dome in Indianapolis December 18, 2005. REUTERS/Brent Smith 

Pittsburg Steelers flanker Hines Ward (C) runs in for the touchdown between Indianapolis Colts' Bob Sanders (L) and Gary Brackett (R) during the first quarter of NFL play at the RCA Dome in Indianapolis, Indiana November 28, 2005. REUTERS/Brent Smith 

Pittsburgh Steelers halfback Jerome Bettis (L) fights to break free from Indianapolis Colts Bob Sanders (R) during the second quarter of NFL play in Indianapolis, Indiana November 28, 2005. REUTERS/Frank Polich 

Cincinnati Bengals wide receiver Chad Johnson (85) is tackled from behind by Indianapolis Colts Bob Sanders (21) during the third quarter of play at Paul Brown Stadium in Cincinnati November 20, 2005. The Colts won 45-37 to remain undefeated at 10-0. REUTERS/John Sommers II 

Indianapolis Colts defensive back Bob Sanders (21) stops St. Louis Rams running back Steven Jackson while Colts defensive back Mike Doss (20) pursues the play during the first quarter of NFL action in Indianapolis October 17, 2005. REUTERS/Brent Smith 

Indianapolis Colts defensive back Bob Sanders (R) intercepts the ball after it bounced off Tennessee Titans wide reviver Drew Bennett (L) during the first half of their NFL game at The Coliseum in Nashville, Tennessee, October 2, 2005. REUTERS/M. J. Masotti, Jr. 

Tennessee Titans running back Chris Brown (L) is tackled by Indianapolis Colts defensive back Bob Sanders (bottom) during the first half of their NFL game at The Coliseum in Nashville, Tennessee, October 2, 2005. REUTERS/M. J. Masotti, Jr. 

New England Patriots running back Kevin Faulk (33) leaps across the line on his way to a first down past the defense of Indianapolis Colts defender Bob Sanders (21) during the second quarter of their NFL AFC Divisional playoff game in Foxboro, Massachusetts, January 16, 2005. The Patriots won the game 20-3 to advance to the AFC Championship game against the Pittsburgh Steelers next week. REUTERS/Mike Segar MS 

New England Patriots running back Corey Dillon (R) runs away from Indianapolis Colts defender Bob Sanders (21) during the third quarter of their AFC Divisional playoff game in Foxboro, Massachusetts, January 16, 2005. The Patriots won the game 20-3 to advance to the AFC Championship game against the Pittsburgh Steelers. REUTERS/Mike Segar MS/SV 

Denver Broncos tight end Jeb Putzier (88) catches a Jake Plummer pass past Indianapolis Colts back Bob Sanders (21) in the second quarter in Denver January 2, 2005. REUTERS/Rick Wilking RTW/JDP 

Indianapolis Colts defenders Gary Brackett (L), Joseph Jefferson (rear) and Bob Sanders (R) wrap up Jacksonville Jaguars kick returner Troy Edwards (with ball) at the RCA Dome in Indianapolis, October 24, 2004. Jacksonville kicked a field goal late in the fourth quarter to win 27-24 REUTERS/Brent Smith BS/SV 

The class of 2004 National Football Hall of Famers pose for photos following the induction ceremony at the Pro Football Hall of fame in Canton, Ohio August 8, 2004. From left to right are: former Detroit Lions running back Barry Sanders, Denver Broncos quarterback John Elway, Minnesota Viking defensive end Carl Eller and offensive lineman Bob Brown who played for the Philadelphia Eagles, Los Angeles Rams and Oakland Raiders. REUTERS/Ron Kuntz RK 

Former Detroit Lions running back Barry Sanders faces reporters during a news conference in Houston, Texas, January 31, 2004. The Pro Football Hall of Fame announced the 2004 class of inductees; John Elway, Barry Sanders, Carl Eller and Bob Brown. REUTERS/Marc Serota MS 

Former Detroit Lions running back Barry Sanders, pauses during a news conference in Houston, Texas, January 31, 2004. The Pro Football Hall of Fame announced the 2004 class of inductees John Elway, Barry Sanders, Carl Eller and Bob Brown. REUTERS/Marc Serota MS/JDP 

Former Denver Broncos quarterback John Elway, smiles at a news conference in Houston, Texas, January 31, 2004. The Pro Football Hall of Fame announced the 2004 class of inductees John Elway, Barry Sanders, Carl Eller and Bob Brown. REUTERS/Marc Serota MS/JDP 

Former Denver Broncos quarterback John Elway, answers questions from the media during a news conference in Houston, Texas, January 31, 2004. The Pro Football Hall of Fame announced the 2004 class of Enshrinees John Elway, Barry Sanders, Carl Eller and Bob Brown. REUTERS/Marc Serota MS/JDP 

Former Denver Broncos quarterback John Elway speaks to the media during a press conference in Houston, Texas, January 31, 2004. The Pro Football Hall of Fame announced the 2004 class of inductees, John Elway, Barry Sanders, Carl Eller and Bob Brown. REUTERS/Marc Serota MS/SV 

Former Denver Broncos quarterback John Elway (R), Detroit Lions running back Barry Sanders and Minnisota Vikings defensive end Carl Eller (L) pose during a news conference in Houston, Texas, January 31, 2004. The Pro Football Hall of Fame announced the 2004 class of inductees John Elway, Barry Sanders, Carl Eller and Bob Brown. REUTERS/Marc Serota MS/JDP