Two U.S. senators in jeopardy on big day of voting 18 May 2010 With voter anger running high, two veteran U.S. senators face potential career-ending challenges on Tuesday in primary contests that could measure the anti-Washington mood before November's midterm elections. Democrats Arlen Specter of Pennsylvania and [corporate-owned] Blanche Lincoln of Arkansas face strong tests from the left. Also, a U.S. Senate race in Kentucky between a Republican establishment favorite and a conservative "Tea Party" activist will test the strength of that loosely organized movement.