[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2010/POLITICS/09/14/primary.elections/story.delaware.gi.jpg caption="Tea Party favorite Christine O'Donnell is challenging nine-term Republican Rep. Mike Castle in Delaware's GOP Senate primary." width=300 height=169]
CNN Wire Staff
(CNN) - Tea Party favorites faced off against mainstream Republican candidates in two key races Tuesday, the final day of major primary balloting before the November congressional elections.
Other races taking place in seven states and the District of Columbia included embattled veteran Rep. Charles Rangel's attempt to overcome ethics allegations and win his Democratic primary in New York, and D.C. Mayor Adrian Fenty's bid to hold off a major primary challenger.
In the highest-profile races, the results will provide further evidence of whether the Tea Party movement can continue to knock off moderate GOP contenders. The victors will run in November against Democrats considered vulnerable due to high unemployment and a general anti-incumbent mood across America.
In Delaware, nine-term Republican Rep. Mike Castle is in a tight contest with political commentator and Tea Party favorite Christine O'Donnell in the GOP U.S. Senate primary.
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