USA Today/Gallup poll of registered swing state voters:

Romney 48 — Obama 47
Obama 54 — Gingrich 40
Obama 50 — Paul 43
Obama 51 — Santorum 44

Conducted Jan. 24 — 28, 2012. Margin of error 5 points.
States surveyed: Colorado, Florida, Iowa, Michigan, Nevada, New Hampshire, New Mexico, North Carolina, Ohio, Pennsylvania, Virginia and Wisconsin.