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Another round of key primaries will be held on Tuesday and incumbents are finding their seats challenged by political newcomers as well as local and state candidates in a political season marked by an anti-Washington mood.
Eleven states are holding primary contests Tuesday.
Arkansas Sen. Blanche Lincoln faces off against Lt. Gov. Bill Halter in a Democratic primary runoff, while in Nevada Harry Reid will finally get an opponent in the Republican race to challenge the Senate majority leader.
California Sen. Barbara Boxer, who is potentially endangered, will learn her challenger as voters in the state also decide who will win the Democratic and Republican nominations for the seat being vacated by term-limited two-term Republican Gov. Arnold Schwarzenegger.
In Nevada, three viable Republican candidates are hoping to take on Senate Majority Leader Harry Reid. Tea Party favorite Sharron Angle has surged of late against businessman Danny Tarkanian and former state lawmaker Sue Lowden.
In the race for South Carolina governor, nothing is out of bounds, as months of attacks in the Republican primary have led up to a last-minute scandal throwing the race into chaos.