President Barack Obama is on the campaign trail for Senate Majority Leader Harry Reid (D-Nev.) for the third time this year — a sign of just how seriously the White House is taking Reid’s political vulnerability heading into the November elections.

Obama will spend Thursday evening at two fundraisers for Reid in Las Vegas. He will give remarks at 6:15 p.m. local time at an event for Reid at Aria Resort and Casino, and then at 7:30 p.m., he will attend a closed dinner for Reid at the same location. The president will appear again with Reid on Friday morning during a public speech about the economy at the University of Nevada at Las Vegas.

Reid, who is locked in a dead heat with his GOP challenger, Sharron Angle, has leaned heavily on Obama during his campaign and shared a stage with him more than nearly all of his Congressional colleagues. The president headlined major fundraisers for the Senate leader in February and again in May in Nevada.

White House spokesman Bill Burton acknowledged Thursday that Reid is in a competitive race but called him a “fighter” and said that spirit will carry him through to victory in November.

“We’re confident that he’s going to come back and continue to be our leader, come next year,” Burton told reporters.

Before heading to Nevada, Obama will spend the afternoon stumping for Missouri Senate Democratic candidate Robin Carnahan. The president will give remarks at 2:05 p.m. local time at a fundraiser for Carnahan at the Kansas City Marriott. He will also deliver a speech at a grass-roots event for Carnahan at 2:45 p.m. at Folly Theater.

Vice President Joseph Biden will also spend Thursday lending his star power to Democrats on the campaign trail. He will attend a 1 p.m. event for Rep. Kurt Schrader (D-Ore.) in Portland, Ore., and a 5:30 p.m. event for Sen. Barbara Boxer (D-Calif.) in Atherton, Calif.