I don’t know what Bloomberg Politics is going to be like ultimately, but they do have a nifty story with graphics on how many television ads have been run by or in conjunction with Senate races so far this year, and as you might expect, Iowa leads the pack with 101,181 spots.
In terms of ad quantity, Republicans have a distinct advantage in Iowa, along with Kentucky (as you might expect) and Georgia. Democrats have a notable advantage in North Carolina, Louisiana and Alaska, and the two parties are pretty much even in Michigan, Arkansas and Colorado.
A supplemental chart shows that of just under a million ads run in these nine competitive Senate campaigns, Republicans and their allies have run an astounding 267,000 ads that basically just bash Obama, and another 175,000 attacking Obamacare. So much for that positive alternative message.