I used to tell my ex, “never tick off a songwriter.” I mean, think about Sting’s first wife and “Every Breath You Take.” He’ll be watching her to the ends of time, every time get gets on an elevator. (Or a “lift” in less-than-Merry Olde England.) Among the ranks of those best left un-rankled are cartoonists. Nothing says “my ass is grass” like seeing yourself immortalized in the comics. But if Reagan was the “Teflon President,” Obama’s been The President Comic Artists Hate to Lampoon. Up until now.