So John McCain is making another run at Dave Letterman this evening. Instead of explaining why he's rushing back to Washington to "save Wall Street", this time he's probably going to try to explain why Mitt Romney isn't a douchebag for being a Wall Street financier.
But, Dave's been burned by McCain before, so he's taking steps:
I guess that's "fair warning" to McCain what's in store for him -- if he decides to stand up Dave again!
Dave Letterman: the King of Snark.