According to Rasmussen Reports:
Just before midterm congressional elections in which the new national health care law has been a major issue, 58% of Likely U.S. Voters favor repeal of the measure, including 45% who Strongly Favor it.
The majority of voters have favored repeal in every weekly Rasmussen Reports survey since Democrats in Congress passed the law in late March. Voter support for repeal has ranged from a low of 50% to a high of 63%.