The liberal activist group Campaign for America’s Future announced today the results of the straw poll of attendees to its “America’s Future Now” conference, and found that 63 percent of respondents said they would not support health care legislation that did not create a new a government-run plan, even if that was the only way to get a bill passed.

While, like any straw poll, the results should be taken with a grain of salt, they do speak to the pressure that Democrats will be under by their liberal wing to offer a government-run plan modeled after Medicare. On Monday, a number of liberal groups used the conference to announce an $82 million effort to support President Obama’s health care push and press for the government-run plan, which they call the “public option.”

There is some indication that the pressure by liberal groups is already starting to have an effect in making moderate Democrats more open to the idea.