Ordinarily, I'm opposed to pushing the rhetorical Hitler button when arguing with one's political opponents, regardless of the identity or beliefs of those opponents. It's a different story, of course, when one's opponents embrace the comparison.
Can't imagine it happening? Well, thanks to TRH, you don't have to use your imagination. You just have to read this.
And then, like Mother Jones said, pray for the dead and fight like hell for the living.
UPDATE, March 22: Just in case you need more evidence.