Why do you say Colorado goes GOP? Most of the polling has been rather in favor of Obama there, no? On the whole the polls seem to put Ohio more GOP leaning than Colorado, if I remember correctly.
Ohio is pretty much a toss-up between Romney and Obama according to 5 polls over the last 90 days. [Quinnipiac 9/28 R+2; PPP 10/18 tie; Quinnipiac 10/26 D+4; PPP 10/9 D+9; and Quinnipiac 12/8 R+1]. Gingrich trailed Romney's results by 2% and 4% in the last two polls.
CO has only had one poll during the last 90 days by PPP on 12/7 with D+2 vs Romney and D+7 and at the 50% threshold vs Gingrich. Obama led Romney in two earlier PPP polls for CO by 6-7%.