Most Americans said they did not expect real progress in improving the economy, reforming the health care system or ending the war in Iraq — three of the central promises of Mr. Obama’s campaign — for at least two years. The poll found that two-thirds of respondents think the recession will last two years or longer…

“I think those of us who voted for McCain are going to be a lot happier with Obama than the people who voted for him,” Valerie Schlink, 46, a Republican from Valparaiso, Ind., said in an interview after participating in the poll. “A lot of the things he said he would do, like pulling out the troops in 16 months and giving tax cuts to those who make under $200,000, I think he now sees are going to be a lot tougher than he thought and that the proper thing to do is stay more towards the middle and ease our way into whatever has to be done…

The poll found overwhelming support for a large stimulus package to rescue the economy. Americans were divided, though, about whether Mr. Obama’s spending plan was too big, as some Republicans in Congress have argued, or not big enough, as some liberal economists argue. In the poll, 23 percent said his plan went too far, while 28 percent said it did not go far enough.