Democratic 2020 U.S. presidential candidates (L-R) former New York City Mayor Michael Bloomberg, former South Bend Mayor Pete Buttigieg, Senator Elizabeth Warren, Senator Bernie Sanders, former Vice President Joe Biden, Senator Amy Klobuchar and billionaire activist Tom Steyer take the stage for the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Randall Hill TPX IMAGES OF THE DAY 

Democratic 2020 U.S. presidential candidates Senator Amy Klobuchar and billionaire activist Tom Steyer debate at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY 

Democratic 2020 U.S. presidential candidate Senator Elizabeth Warren speaks to Senator Bernie Sanders at the conclusion of the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY 

Democratic 2020 U.S. presidential candidate and former New York City Mayor Mike Bloomberg speaks during the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Former South Bend Mayor Pete Buttigieg speaks as Senator Elizabeth Warren raises her hand during the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate Senator Bernie Sanders walks on stage during a break in the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates Senator Bernie Sanders and former Vice President Joe Biden participate in the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY 

Democratic 2020 U.S. presidential candidates (L-R) former New York City Mayor Michael Bloomberg, former South Bend Mayor Pete Buttigieg, Senator Elizabeth Warren, Senator Bernie Sanders, former Vice President Joe Biden, Senator Amy Klobuchar and billionaire activist Tom Steyer take the stage for the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Former New York City Mayor Mike Bloomberg speaks during the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate Senator Bernie Sanders speaks at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate billionaire activist Tom Steyer speaks during the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates Senator Bernie Sanders and former Vice President Joe Biden participate in the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate Senator Elizabeth Warren speaks at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate Senator Amy Klobuchar speaks at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate and former South Bend Mayor Pete Buttigieg speaks during the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates Senator Bernie Sanders and former Vice President Joe Biden talk at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates Senator Elizabeth Warren, Senator Bernie Sanders, and former Vice President Joe Biden debate in the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Supporters of Democratic 2020 U.S. presidential candidate Senator Bernie Sanders watch a screening of the tenth Democratic 2020 presidential debate from a watch party in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Elizabeth Frantz 

Democratic 2020 U.S. presidential candidates Senator Bernie Sanders listens to former Vice President Joe Biden talk at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate and former Vice President Joe Biden crosses his arms during a commercial break at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY 

Democratic 2020 U.S. presidential candidates former New York Mayor Mike Bloomberg, Senator Bernie Sanders and former Vice President Joe Biden listen as former South Bend Mayor Pete Buttigieg and Senator Elizabeth Warren discuss an issue during the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates Senator Bernie Sanders and former Vice President Joe Biden talk at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates Senator Bernie Sanders makes a point as former Vice President Joe Biden listens at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidate former Vice President Joe Biden speaks at the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Democratic 2020 U.S. presidential candidates former South Bend Mayor Pete Buttigieg listens to Senator Elizabeth Warren in the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020.