In a videotaped message, President Barack Obama is urging supporters to canvas their neighborhoods Saturday in support of his budget, the latest step in a growing campaign by the White House to galvanize popular support for his proposals.

The video, which appears on YouTube, is being circulated by Organizing for America, the grass-roots group that grew out of Obama’s campaign e-mail list to support his policies as president. The Democratic National Committee is also circulating the video.

In the appearance, Obama points to proposals that he has made in health care, energy and education, saying, “That’s the change I ask you to work for now, block by block and door by door.— And he touts the budget as a fiscally responsible initiative that will “lay a foundation for lasting growth and prosperity.—

The president seeks to revive the spirit of the volunteers who drove his campaign.

“Passing this budget won’t be easy — we’re already hearing the same worn arguments we’ve heard for years,— Obama says. “That’s why I’m asking you to head outside this Saturday to knock on some doors, talk to some neighbors and let people know how important this budget is to our future. And that’s why I’m asking you to stay involved in the days ahead, by writing letters and making phone calls, summoning that spirit that first gave us this chance for change.—