Las Vegas ? Control of Congress at stake on Nov. 2, President Barack Obama appealed to voters Friday to stick with Democrats although times are tough and the electricity of his presidential campaign can seem like a faded memory.

“We’ve just begun. We’re just in the first quarter. I can’t have you tired now,” Obama said at a rally for Senate Majority Leader Harry Reid on the third day of a four-day campaign swing aimed at protecting Democratic majorities in the House and Senate. “I can’t have you tired when we’re just getting started.”

Obama had delivered an identical message just hours earlier in Los Angeles, where he campaigned for California Sen. Barbara Boxer.

Trying mightily to reknit the coalition that sent him to the White House, Obama was reaching out to Latino voters, college students, women and others as he sought to boost the candidacies of key congressional allies whose fate on Election Day will help determine what happens to the rest of his agenda.

The president has been logging miles since Wednesday, campaigning in Oregon, Washington state, California and Nevada on a five-day swing that ends today in Minneapolis.

Boxer is in a tight race with former Hewlett-Packard Chief Executive Carly Fiorina. Reid is in a tossup against tea party-backed Sharron Angle and theirs is the nation’s most closely watched Senate matchup.