From an ABC poll
Gingrich wins South Carolina: How can Romney recover from his terrible defeat? - Slate Magazine
Gingrich has considerable vulnerabilities that Romney must exploit to convince voters that Gingrich would lose in the general election. The former speaker is unpopular nationally and with independent voters. He is also unpopular in his own party. In New Hampshire exit polls, more than 60 percent said they would not be happy if he were the nominee. National polls show the same thing. In a recent Washington Post/ABC News poll, 23 percent of Republicans said they would not support him. Only Ron Paul did worse. Women voters, an important swing voting bloc, do not like Gingrich.
Gingrich wins South Carolina: How can Romney recover from his terrible defeat? - Slate Magazine