Coming out of a campaign cycle recently. Minnesota Campaign Report has some great analysis of the spending for the US Senate race and the Congressional races.
From the periphery, Patty Wetterling out raised EVERY Congressional candidate in the state. Devling into the numbers deeper though, the 6th CD race proved to be as fiercly fought for as we had envisioned.
Bachmann had a sizable edge with regards to the pool of base voters in the 6th, estimated at a 10% advantage. The fight for the "middle 30%" was a spendy fight. Both campaigns spent significantly to gain the marginal votes.
I urge you to go to MCR for their work on this, the Daily Kos picked up on this as well.
Great work Joe.