Trust me, its not just the south.
They had to change the rules in Michigan after the vote just to give Romney a two delegate edge. He should have won Michigan by double digits and couldn’t even pull that off.
Romney is weak in the heartland of America from the Dakotas through Iowa, Kansas (21 percent in the caucuses), Missouri, Oklahoma (28 percent), the South etc.
Romney barely won Ohio and Michigan with well under 50 percent of the vote and only reached 48 percent in Illinois with Santorum winning downstate.
Romney runs best (over 50 percent) in liberal urban areas and in suburban areas (over 40 percent) close to liberal cities.