Southwest Washington voters will decide this year whether to reelect Republican Jaime Herrera Beutler to represent the state's 3rd Congressional District or to send one of her eight challengers to Washington D.C. instead, and they'll get their first chance to weight in on Tuesday. Her three leading opponents are Democrat Marie Gluesenkamp Perez and Republicans Joe Kent and Heidi St. John, both of whom are running to Herrera Beutler's right.

The top two vote-getters in the Aug. 2 primary will advance to a runoff in the general election, regardless of party affiliation. That means the two names on the ballot in November could be two Republicans, two Democrats, or one of each. It's also possible Herrera Beutler could be edged out of the race on Tuesday if she fails to win one of the top two slots. Political observes say this year could be her toughest electoral challenge since first winning office in 2010.