http://www.rasmussenreports.com/public_content/politics/elections/election_2012/election_2012_presidential_election/2012_presidential_matchups

Obama	41%	Cain	43%	Oct 14-15, 2011
Obama	49%	Gingrich	34%	Oct 12-13, 2011
Obama	49%	Perry	35%	Oct 10-11, 2011
Obama	43%	Romney	41%	Oct 8-9, 2011
Obama	42%	Johnson	27%	Oct 4-5, 2011
Obama	45%	Santorum	34%	Oct 2-3, 2011
Obama	44%	Paul	34%	Sep 24-25, 2011
Obama	48%	Bachmann	32%	Sep 20-21, 2011
Obama	43%	Huntsman	35%	Sep 16-17, 2011