U.S. Senate minority leader Mitch McConnell (C) waits as his wife Elaine Chao (in red) casts her ballot at a polling station in Louisville, Kentucky, November 4, 2014. American voters will decide which party controls the U.S. Senate in Tuesday's elections, and at least 10 competitive races are still considered too close to predict a winner. Republican McConnell is running against Democratic Senate candidate Alison Lundergan Grimes. REUTERS/Shannon Stapleton (UNITED STATES - Tags: POLITICS ELECTIONS)