I’ve already discussed the GOP’s horrid immigration rhetoric before, so I’ll give Mitt Romney a break today. But via Wonkette come this video of the lone voice of reason on the issue, John McCain, quite awesomely tearing an anti-immigrant heckler to pieces in Michigan.Snap crackle and POP!Some highlights:-The extended “come oooon,” toward the beginning, when the heckler interrupts. Very Deniro-esque.-The end, where he turns away to bask in the glory of his crushing putdown and then gives the heckler a thumbs-up sign.