Here's your answer, which I deal with tangentially in the post that just went up at OTB.
The Quiinipiac and Gallup polls asked respondents if they supported a resolution that included several options, two of which were "only tax cuts" and "only spending cuts." The Rasmussen question merely asks "As part of legislation to raise the debt ceiling,should congress and the president raise taxes?"
Notice what's missing from Scott's question? Any mention of spending cuts. So, basically, he was asking respondents "Are you in favor of raising the debt ceiling and simultaneously raising taxes?" Gee, what do you think people would say?
This is why, in addition to looking at crosstabs and sampling when looking at a poll, you also need to look at the questions that are asked.