MADISON, Wis. -- Democratic Rep. Tammy Baldwin has sent a letter to U.S. Attorney General Eric Holder asking for a federal investigation into the questionable handling of vote records in Waukesha County. "Following this week’s election for the Wisconsin Supreme Court, numerous constituents have contacted me expressing serious doubt that this election was a free and fair one," Baldwin said in the letter. "They fear, as I do, that political interests are manipulating the results." A message left by The Associated Press at Holder's office Saturday wasn't immediately returned. To assure public confidence in our democratic election process and guarantee...