The trailer for the new documentary about Hillary Clinton produced by the conservative group Citizens United opens not with the voice of one of her Republican rivals, but with the deep baritone of Barack Obama. And that's not sitting well with the Illinois senator, who has recently taken pains to paint his campaign as fighting cleaner than those of his Democratic rivals. "Senator Clinton is claiming, basically, the entire eight years of the Clinton presidency as her own, except for the stuff that didn't work out. In which case, she says she had nothing to do with it," Obama says...