Once, Garry Thomas counted himself a Hillary Clinton supporter -- even signing up to be one of her 25 co-chairs in Iowa alongside with former Iowa First Lady Christie Vilsack.
But Thomas now says he felt obliged to switch sides in recent weeks. "I think the Clinton campaign went negative," Thomas said in a telephone interview on Thursday. He attributed his defection to the new tone Clinton took last weekend, describing it as divisive. Obama officials said Thomas committed to them this week.