Indiana ? Hillary Rodham Clinton was jolted Thursday by the defection of one of her longtime superdelegate supporters, a former national party chairman who urged fellow Democrats to “reject the old negative politics” and unify behind Barack Obama.

“A vote for Hillary Clinton is a vote to continue” a long, self-destructive Democratic campaign, Joe Andrew added in a letter designed to have an impact on the turbulent race nationally as well as in his home state of Indiana, site of a primary next week.

“A vote to continue this process is a vote that assists John McCain,” Andrew wrote.