Battle for the Senate

Senate Minority Leader Mitch McConnell (R-Ky.), likely to defeat his tea party challenger, is expected to face stiff competition in a general election fight with Alison Lundergan Grimes, the state's secretary of state.

Senate Minority Leader Mitch McConnell (R-Ky.), likely to defeat his tea party challenger, is expected to face stiff competition in a general election fight with Alison Lundergan Grimes, the state’s secretary of state.  (Michael Reynolds / EPA)

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With the Senate up for grabs, both parties are investing resources into key tossup races as Democrats hope to hold on to their slim majority and Republicans attempt to eliminate it.

North Carolina

Sen. Kay Hagan (D-N.C.), one of several vulnerable Democrats up for reelection, has tried to campaign on her moderate stances. But a vote for the Affordable Care Act could hurt Hagan in her race against Thom Tillis, the state’s House speaker.  (Gerry Broome / Associated Press)

Louisiana

Sen. Mary Landrieu (D-La.), who was first elected in 1996, faces a difficult bid to keep her seat in a state that often leans Republican. In a recent ad, Landrieu distanced herself from President Obama, calling his positions on energy “simply wrong.”  (Manuel Balce Ceneta / Associated Press)

Georgia

Republican candidates for an open Senate seat in Georgia square off at a debate on April 19. The winner is likely to face Michelle Nunn, who is leading in Democratic primary polls.  (Sara Caldwell / AP)

Colorado

Sen. Mark Udall (D-Colo.) is seeking reelction in what is expected to be a tight race. Polls show Udall running neck-and-neck with his Republican challenger, Rep. Cory Gardner.  (David Zalubowski / Associated Press)

Alaska

Sen. Mark Begich (D-Alaska), left, who voted for Obamacare, is branding himself as “independent” in an attempt to to defeat his Republican challenger in a competitive state.  (J. Scott Applewhite / Associated Press)

Arkansas

Sen. Mark Pryor (D-Ark.), a two-term senator, is campaigning in a close race against Rep. Tom Cotton (R-Ark.), an Army veteran who attended Harvard Law School.  (Danny Johnston / Associated Press)