Joe Scarborough believes Christine O'Donnell's win has cost Republicans the Delaware Senate seat and their best shot at a Senate majority. And the Morning Joe host made no bones about singling out the person he considers responsible: "I blame Sarah Palin," said Scarborough bluntly on today's show. Scarborough's comment came not long after Morning Joe aired a clip of Karl Rove's scalding comments about O'Donnell, which I noted here last night, in which among other things the former Bush adviser declared that O'Donnell "doesn't evince the characteristics of rectitude and truthfulness and sincerity and character that voters are looking for."...