Endorse Kerry. Why? Because, like many other true Republicans, they recognize that conservatives are responsible for the current mess that is the US, and that they must get rid of the man and administration that screwed it up. That means voting out Bush and regrouping with real conservatives in four years.
And if they do, and there is a suitable Republican candidate in 2008, I will consider voting Republican again. But as long as Bush remains in power, no Republican will ever get my vote.