The Obama campaign is out with a few new ads today. Up in four states, this one hits Romney for his evasiveness on both his and voters' taxes:

And here they work in the AARP Voter Guide for an ad targeting seniors (ad buy size/scope unknown):

The Obama people also announced an $8 million buy in Wisconsin, and they've released a new TV ad thumping Romney/Ryan again on women's issues. Meanwhile, the Romney campaign is extending last week's avalanche with another $8.1 million, as well as translating its Medi-scare attacks on Obama (ad buy size/scope unknown):

Stepping back, an independent study suggests that Obama's post-convention bounce may be at least partially the result of his team's ad strategy:

According to the Wesleyan Media Project's analysis of Kantar Media Campaign Media Analysis Group data between Aug. 26 and Sept. 8, Obama and his allies aired 40,000 ads. During the same time, Romney and his allies aired 18,000 ads on broadcast and national cable. That added up to $21.1 million spent by the pro-Obama camp, versus $12.9 million spent by the Romney side. "This advantage may help to explain why Obama's convention bounce was larger than Romney's," concluded Erika Franklin Fowler, co-director of the Wesleyan Media Project.

Elsewhere, the RNC is pushing grassroots campaigning in a new web video. And in outside spending news, Rove's American Crossroads Super PAC has produced its own version of the RNC's "Heard It All Before" videos, which NRO says "is apparently a test run for a national campaign in the closing weeks":

The pro-Romney Super (non-profit "issues") PAC American Future Fund released a bizarre ad saying that Obama is the preferred candidate of Wall Street (ad buy size/scope unknown):

Lastly, from the other side in outside spending, the pro-Democrat House Majority PAC is dropping $2.2 million on six new ads attacking House Republicans.

Ad War archive here.