Braley was tripped up earlier this week when video surfaced of him referring to popular Sen. Charles E. Grassley (R-Iowa) as a "farmer from Iowa who never went to law school." Braley later apologized for the remark, which he made at a January fundraiser in the context of a discussion about Grassley possibly becoming the next chairman of the Senate Judiciary Committee.
Polls show Braley leading his Republican opponents. But Weiland, a former Tom Daschle aide, is an underdog. He's likely to face former governor Mike Rounds (R) in the general election.