(CNN) - Tuesday's primary contests will put the nation's anti-Washington mood to the test as voters choose between incumbents and anti-establishment candidates.
The races come in the wake of some tough blows to sitting lawmakers: Sen. Bob Bennett, a three-term senator, failed to advance at the Utah GOP convention, and Rep. Alan Mollohan didn't win over fellow Democrats in last week's West Virginia primary.
Leaders of both parties agree - it's a tough year for experienced politicians.
"There is no question. There is, at this moment, an anti-incumbent mood," said House Speaker Nancy Pelosi, D-California. And House Minority Leader John Boehner, R-Ohio, warned, "It's 'politicians beware.' "