Why can't Republicans support health-care reform?

Ezra Klein asks Is this why Republicans can't support health-care reform? This being that health care premiums will go up because we'll be insuring all those high-cost folks we don't insure now. We've been down this road before. The comment I left:

Under our current system, the $10 folks are not necessarily uninsured. In fact, they're quite likely already on Medicare. The un-insured include a whole lot of people in the $2 range (young adults, for example). So, I think the whole argument that it's the cost side that will drive up premiums is bogus. It makes me crazy when I hear people talking about how much more expensive it will be to cover everybody when many of the most expensive to insure (the elderly) are already covered.
That being said, I do think premiums will go up, because without some kind of regulation of premiums, the individual mandate will allow insurers to raise prices, especially if there's no public option and so, no competition in a lot of places.

So it's still a big mystery why Republicans won't support health care reform. Here's my list of suspects:
- Must oppose Obama, no matter what he does! Obama's for puppies? We're against 'em. Never liked them in fact! Puppies are known socialists! {translation: Republicans have painted themselves into a corner by continually feeding their far-right base red meat; now that's all that's left, and they must be fed, or the Republicans will get zero votes in the mid-terms}
- Health insurance campaign donations. {not that the congressional Democrats don't also get this money; you may note their somewhat tepid enthusiasm for reforming health-care; but the topic is the Republicans}

I think that's a fine list and I vote for all of the above! For the record, I support single payer.