You may be hearing about a snap poll from CNN taken right after President Obama's speech last night that shows a gain in support for his health care proposal, from 53% to 67% in favor.

While it is true that the president picked up support in the poll, what you won't hear is how that poll oversampled Democratic voters by a wide margin:

The CNN/Opinion Research Corporation poll was conducted just before and just after the president's speech, with 427 adult Americans questioned by telephone. The survey's sampling error is plus or minus 5 percentage points.

The sample of speech-watchers in this poll was 45 percent Democratic and 18 percent Republican. Our best estimate of the number of Democrats in the voting age population as a whole indicates that the sample is about 8-10 points more Democratic than the population as a whole.

I've heard this poll referenced several times already by the media. No one is mentioning the oversample of Democrats.