[Yahoo Answer Angel]

...Texas and Ohio? “Obamacans,” as the campaign likes to call its Republican supporters, offer a variety of reasons for turning out for Obama, not the least of them a lack of interest in the Republican primary now that Sen. John McCain of Arizona has all but wrapped up his party’s nomination. Others say they genuinely think Obama is the best candidate for change.
But a significant proportion say they are temporarily backing Obama for strategic reasons. They plan to vote Republican in November, but for now, their goal is to try to make sure Clinton cannot win.
Although he said he sincerely supported Obama, Rau acknowledged that “Hillary kind of represents the antithesis of a lot of Republican values.”