fav/unfav %:
Carson 25/16% for +9%
Clinton 47/44% for +3%
Warren 25/26% for -1%
Biden 41/44% for -3%
Huckabee 31/39% for -8%
Paul 31/39% for -8%
Santorum 33/43% for -10%
Romney 34/49% for -15%
Christie 30/48% for -18%
Bush 28/48% for -20%
How in the world?
Easy. Romney was never a popular candidate. His favorables went up solely because of his first debate performance against Obama. They rescinded to reality when that was no longer a factor.
Christie's bridge scandal has caused him to dip severely, because it's changed his image from a governor who spouts common sense to an angry bully. It's not necessarily the scandal, it's the narrative.
And Bush might as well be Huntsman with a bad name.
