WASHINGTON — When Tea Party activists swamped town hall-style meetings about health care in the summer of 2009, President Obama’s army of campaign volunteers largely stayed away, seemingly less interested in fighting for legislation than they had been in electing the nation’s first African-American president.

Now, Mr. Obama is seizing a second chance to keep his election-year supporters animated.

With lawmakers scheduled to return to work on Monday to begin intense discussions before a looming fiscal deadline, Mr. Obama’s aides are trying to harness the passions that returned him to the White House, hoping to pressure Republicans in Congress to accept tax increases on the wealthy. The president’s strategists are turning first to the millions of e-mail addresses assembled by the campaign and the White House.

Already, supporters are being asked to record YouTube videos of themselves talking about the importance of raising taxes on the rich. Aides said those videos would be shared on Facebook and Twitter and would be forwarded to centrist Democrats, as well as to mainstream Republicans, who they hope will break with their Tea Party colleagues.

An e-mail last week urged activists to share with their friends a graphic explaining the president’s tax argument. And Mr. Obama’s campaign manager sent an e-mail appeal asking supporters to fill out a survey about issues they would like to stay involved in.