A large majority of registered voters, including 77 percent of Republicans, say it's a bad idea for members of Congress to sign a pledge to never raise taxes on the wealthy, according to a new Quinnipiac University poll released Thursday. 

Overall, 85 percent of voters said it's a bad idea to sign a pledge to an anti-tax group opposing taxes on corporations or the wealthy under any circumstance. 

It's worth noting that the actual pledge that most Republican members of Congress have signed is a ban on all tax increases; it does not single out the wealthy as Quinnipiac did. 

In general, 65 percent of respondents supported higher tax rates for those earning more than $250,000 per year. Sixty-seven percent opposed eliminating the home mortgage interest tax deduction, and 70 percent oppose Medicaid funding cuts. Opinion on gradually raising the Medicare eligibility age is more evenly split; 51 percent oppose. 

Less than half of respondents (48 percent) said they thought Congress and the White House would agree on a plan to avoid automatic tax hikes and spending cuts at the end of the year. Fifty-six percent of voters think Obama and Democrats will act in good faith during negotiations; 51 percent think congressional Republicans won't.

Meanwhile, Obama's approval rating is at its highest in three years, 53 percent approval to 40 percent disapproval. The last time he scored so high in Quinnipiac polling was just after the death of Osama bin Laden.