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FiveThirtyEight

Sen. Mark Udall, left, and Rep. Cory Gardner shake hands backstage before a debate on Oct. 7 in the auditorium of The Denver Post in Denver.
Mary Kay Thill reads a Chicago Tribune newspaper on Nov. 8, 2000 at the Park Ridge, Illinois, Library
Democratic Sen. Kay Hagan speaks with volunteers and supporters during an event at a campaign office in Statesville, North Carolina in  September.
U.S. Sen. Mark Udall, right, applauds as U.S. Sen. Elizabeth Warren, left, speaks to a gathered crowd during a rally on the campus of the University of Colorado, in Boulder.
Senate Minority Leader Mitch McConnell speaks on Thursday at the Young Professionals Association of Louisville in Louisville, Kentucky.
Annie Laura Howard Stephens holds a Michelle Nunn sign at a rally for the Democratic candidate for U.S. Senate before early voting at Fulton County's Adamsville Recreation Center on Wednesday in Atlanta.
U.S. Senate Minority Leader Mitch McConnell, right, and his Democratic opponent, Kentucky Secretary of State Alison Lundergan Grimes, rehearsed with host Bill Goodman before their appearance on Monday on  "Kentucky Tonight," live from KET studios in Lexington, Kentucky.
New Jersey Gov. Chris Christie, right, speaks to reporters next to Republican Scott Brown after endorsing him for U.S. Senate during a campaign event in Salem, New Hampshire, in September.
Representative Bill Cassidy, the Republican candidate for U.S. Senate in Louisiana, at a campaign stop at VFW Post 5951in Bossier City on Monday.
Republican challenger U.S. Rep. Cory Gardner makes point during his senatorial debate with incumbent U.S. Sen. Mark Udall, D-Colo., at The Denver Post in Denver on Tuesday, Oct. 7, 2014.
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