Republican Senate candidate Linda McMahon concedes the election to Democrat Chris Murphy on Tuesday in Stamford, Conn.
November 6, 2012 Republican Senate candidates Linda McMahon in Connecticut and Tom Smith in Pennsylvania spent a combined $56 million of their own money in losing efforts.
U.S. Sen. Sherrod Brown (right), D-Ohio, debates his Republican challenger, Ohio state Treasurer Josh Mandel, at the City Club in Cleveland on Oct. 15.
November 1, 2012 Republican candidates have benefited more than twice as much as their Democratic counterparts from the spending by outside groups. More than 80 percent of all the Republican outside money comes from secret donors. On the Democratic side, less than 10 percent of the money is secret.
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Democatic Rep. Shelley Berkley greets Republican Sen. Dean Heller before the second of their three debates, on Oct. 11 in Las Vegas.
October 18, 2012 It's not just the presidential contest that's being watched in swing state Nevada. GOP Sen. Dean Heller's race against Democrat Shelley Berkley is also seen as a tossup. That's a bit of a surprise for Republicans, who have counted on retaining the seat as they try to build a Senate majority.
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Rep. Todd Akin, R-Mo., says Rep. Paul Ryan, R-Wis., the GOP vice presidential candidate, asked him to end his Senate bid after recent comments he made referring to "legitimate rape."
August 22, 2012 After his remarks about rape and pregnancy, Missouri Republican Todd Akin faces an uphill climb in his Senate contest against Democratic incumbent Claire McCaskill. One expert says that to attract moderate voters, Akin must steer the conversation to the economy.
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July 10, 2012 The Democratic Senatorial Campaign Committee says pro-Republican groups aren't playing by the rules. It plans to file a complaint accusing a trio of "social welfare" groups of abusing the rules to hide the identities of their donors.
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Massachusetts Senate candidate Elizabeth Warren is shown here attending a 2010 Capitol Hill hearing on the Troubled Asset Relief Program.
Alex Wong/Getty Images
May 16, 2012 U.S. Senate candidate Elizabeth Warren's claims of Native American heritage seem uneasy to swallow. But why? What does it take to be considered an ethnic minority, and what does the controversy say about the way we judge ethnic backgrounds?
January 17, 2012 In the battle for control of the Senate, Republicans have the numbers on their side — 23 of the 33 seats at stake this year are held by Democrats or Dem-leaning independents. But can they get the majority?
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