Bachmann ran for president in 2012 and briefly led the field.
The Minn. Dem has another weak fundraising quarter and won't say whether he'll run again.
The Minnesota Democratic senator now has $4.8 million in the bank for his reelection battle.
Businessman Mike McFadden (R) pulled in $780,000 in the last three months of 2013.
Americans for Prosperity is going up with ads against Reps. Rick Nolan and Ann McLane Kuster.
The ad from the American Future Fund accuses Peterson of ignoring his constituents.
A new PPP poll found Franken leads his potential GOP opponents by 10 to 13 percentage points.
Rep. Michele Bachmann (R-Minn.) said ObamaCare was never going to work from the get-go, and dubbed...