From Rasmussen Reports via Greg Mankiw’ blog:

Only 53% of American adults believe capitalism is better than socialism.

The latest Rasmussen Reports national telephone survey found that 20% disagree and say socialism is better. Twenty-seven percent (27%) are not sure which is better….

Republicans – by an 11-to-1 margin – favor capitalism. Democrats are much more closely divided: Just 39% say capitalism is better while 30% prefer socialism.