Obama vs. Romney: Who Has the Better Graffiti?

Presidential elections draw out all sorts of ridiculous polling methods. One steakhouse in D.C. will announce the presumptive 2012 winner based on how many people buy candidate-themed burgers. Then there's the tactic of examining whose Halloween mask sells better, which actually has been startlingly accurate.

Here's another approach not sanctioned by Real Clear Politics: Who has a more impressive graffiti presence? Meaning, which candidate has better motivated street artists to spend hours of their time splashing his likeness on an alley wall somewhere?