President Barack Obama is lending some serious political muscle to Sen. Barbara Boxer (D-Calif.) on Monday night, with plans to hit three fundraisers on her behalf in her home state.

Obama is slated to deliver back-to-back remarks at a reception and at another fundraising event for Boxer and the Democratic National Committee at the California Science Center in Los Angeles. The president will then head to the city’s Museum of Natural History to give another speech at a Boxer fundraiser.

The three-term Senator is gearing up for a tough re-election battle: two polls conducted in March showed Boxer’s lead over two potential GOP challengers narrowing to a virtual tie. One of those two surveys, the Field poll, had Boxer leading by double digits as recently as January.

But Boxer is heading into campaign season with a much larger war chest than her Republican opponents: She has $8.7 million in cash on hand for her re-election bid, according to her latest report to the Federal Election Commission. By contrast, former Rep. Tom Campbell reported $1.1 million in cash on hand, former Hewlett-Packard executive Carly Fiorina reported $2.8 million and state Assemblyman Chuck DeVore reported just more than $400,000.