You’ll note a few other big-name Republicans refusing to back Cruz, or, at the very least, refusing to take sides in the face of Donald Trump’s nonstop birther attacks.
There’s a reason for that.
Republicans aren’t going to defend Cruz on this because they hate him as much as they hate Trump.
It seems to me they’re hoping Trump and Cruz somehow knock each other out. Or, maybe Cruz takes Trump out and then they can move on Cruz, or maybe Trump takes Cruz out. Either way, the GOP establishment doesn’t want either of the chief clowns in the clown car to be the Republican standard-bearer this year.