Mitt Romney didn't just pay too much in taxes. As Politico reported last month, he paid too much for his TV ads, too.(The following graphic represents early September media buys in Columbus, Ohio. It was provided to TheDC by a national media buyer with extensive background buying in America's most competitive state, and is representative of other examples we have seen):The cost differential is attributable to the fact that Team Obama bought "preemptable" or or "lowest unit rate" ads --- while Team Romney paid for "fixed," non-preemptable rates."Obama could deliver 1,000 points for a fourth as much as Romney," said...