ANNAPOLIS, Md. (AP) - Maryland Sen. Benjamin Cardin has won the Democratic primary.

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The Associated Press called the race Tuesday based on interviews with voters as they left their polling places. 

Cardin, who has served one term in the Senate and 10 terms in the House of Representatives, won against eight primary challengers.

They included Maryland state Sen. C. Anthony Muse of Prince George's County. Cardin picked up key Democratic endorsements, including President Barack Obama, Gov. Martin O'Malley, Lt. Gov. Anthony Brown, Baltimore Mayor Stephanie Rawlings-Blake and Kweisi Mfume, a former congressman and former head of the NAACP.

For the GOP, there are 10 candidates hoping to win the nomination. They included former U.S. Secret Service agent Daniel Bongino and Richard Douglas, a former Bush administration defense department appointee.