11/22/2009 05:12 am ET Updated May 25, 2011

Nate Silver: Health Care Is Hazardous To Poll Numbers For Grassley, Other Senators

One of the things about the so-called Gang of Six -- the group of Senators to which Max Baucus issued an exclusive invitation to participate in health care negotiations -- is that each one started out the year in a place of seeming electoral invincibility. Baucus, Kent Conrad, Jeff Bingaman, Olympia Snowe, Chuck Grassley and Mike Enzi won re-election with an average of 72 percent of the vote as of their last election, and none had a challenger that came closer than 39 points.

Read more on fivethirtyeight.com