I don't think that makes that point. That he's campaigned for a Republican in the past isn't a defense to the claim that he's letting himself be used by the Democrats in the present. The specific claims that he makes in his ad and the facts that he leaves out makes it clear that he has signed onto the Democratic position -- that the prohibition on federal funding for additional lines of stem cell research means that the Republicans don't want people with Parkinson's to get well.

That's a pretty demagogic position, isn't it?

I'm generally thought to be pro-Republican. Does the fact that I first voted for a Republican more than twenty years after I'd been solidly voting for Democrats make that untrue?