RATINGS CHANGE: Minnesota's 6th District

Bachmann's seat is now safer for Republicans. (Tom Williams/CQ Roll Call)

It’s rare that an open seat race decreases a party’s chances of taking over a seat, but that is the story of Minnesota’s 6th District.

Republican Rep. Michele Bachmann is so uniquely polarizing that she managed to make a district that Mitt Romney, John McCain, and George W. Bush won by at least a dozen points look like a congressional battleground.

Now that she has opted for retirement and Democrat Jim Graves, who ran in 2012 and would have been a credible candidate next year, has suspended his campaign, Democrats' chances of winning have dropped dramatically.

New Rothenberg Political Report/Roll Call rating: Currently Safe Republican.