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....