CNN

CNN's Candy Crowley takes a look at what's at stake in Tuesday's Potomac Primary.

WASHINGTON (CNN) - Call it the political battle along the Potomac: Virginia, Maryland and the District of Columbia hold primaries Tuesday.

Presidential candidates in both parties have a lot at stake in these Potomac primaries.

Coming off his sweep in five weekend contests, Sen. Barack Obama of Illinois will be aiming for a political hat trick over Sen. Hillary Clinton of New York.

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