Cain leads a head-to-head GOP race with Romney 47 – 39 percent, coming close to the critical 50 percent mark, even though more Republicans think Romney has the knowledge and experience to be president…

Obama also is looking better in matchups against potential Republican nominees:

47 – 42 percent over Romney, compared to a 46 – 42 percent Romney lead October 5;
52 – 36 percent over Perry, up from a 45 – 44 percent tie last month;
50 – 40 percent over Cain, who was not included in a matchup last month;
52 – 37 percent over Gingrich, who was not matched last month.