From a new Washington Post-Pew poll:
So, 65 percent have heard little or nothing about campaign spending by outside groups, 75 percent think the effect of this spending will be neutral or have no opinion about its effect, 69 percent do not think it will help one candidate more than the other or have no opinion about this, and 60 percent cannot identify what a super PAC is.
These sorts of findings are one reason why, despite Americans' distaste for money in politics, the public rarely provides much impetus for campaign finance reform.