**FILE** Republican presidential candidate Mitt Romney (right) shares a laugh April 1, 2012, with Rep. Paul Ryan (center), Wisconsin Republican, and Sen. Ron Johnson, Wisconsin Republican, during a campaign event in Milwaukee. (Associated Press)

**FILE** Republican presidential candidate Mitt Romney (right) shares a laugh April 1, 2012, with Rep. Paul Ryan (center), Wisconsin Republican, and Sen. Ron Johnson, Wisconsin Republican, during a campaign event in Milwaukee. (Associated Press)