As Donald Trump lurches toward defeat, cocky Democrats are turning their attention to Congress. With Hillary Clinton enjoying a double-digit lead over her billionaire rival in multiple national polls and several traditionally deep-red states up for grabs, Democratic leaders are looking for ways to run up the score by tying vulnerable Republican candidates to their divisive presidential nominee in a last-minute push to retake control of the legislative branch. And President Barack Obama, fresh off a new Gallup poll showing him with a soaring second-term approval rating, is emerging as one of Clinton’s most powerful secret weapons.

While Obama has long avoided endorsing candidates in down-ballot races—in part because vulnerable swing-state Democrats have previously viewed his support as less blessing than curse—the president is suddenly throwing himself into dozens of House and Senate races. With his legacy on the line, Obama is endorsing roughly 150 candidates in 20 states, as he fights to secure signature legislative accomplishments like the Affordable Care Act and a historic climate change agreement with China. The president made the first batch of endorsements Friday, with the remainder expected to be doled out this week and next, Politico reports.

The endorsements will be wide ranging in nature. Obama has reportedly already recorded a number of robocalls and advertisements for Democratic candidates, which will be supplemented with mailers, social media posts, and, in some cases, radio advertisements. The idea is to “make the case to voters that Democrats will put people first and make real progress for our country, while Republicans will continue to put party over country by supporting Donald Trump as their standard-bearer,” Kelly Ward, the executive director of the Democratic Congressional Campaign Committee, told Politico. Obama will even expand his support to include state legislature races.

“As we exit the stage, to make sure that we’re passing the baton not only to Hillary Clinton, but also to a Congress that is willing to do the people’s business.”

As Obama has turned his eye toward supporting down-ticket Democrats in the wake of Clinton’s ascendancy, so too has he turned a withering eye on Republican candidates supporting Trump. And with only a few months left in office, Obama isn’t holding anything back. Senator Marco Rubio, who is running for reelection in Florida, is “willing to be anybody just to be somebody,” Obama said, while Joe Heck, who is running to take Harry Reid’s seat in Nevada, would be just another Trump TV flunky after the election. Ohio senator Rob Portman, Obama suggested, had turned a blind eye when Trump “was attacking minorities, and suggesting that Mexicans were rapists.” California Rep. Darrell Issa received the worst of it Sunday, when Obama called him “shameless” during a blistering address at a fundraiser for the Democratic Congressional Campaign Committee.

With a sky-high approval rating of 57 percent—far higher than either Ronald Reagan or George W. Bush in their second terms—Obama’s backing is in high demand. “Given where this campaign has gone from the national level on down, this is going to be a really good way to push a lot of these folks over the line,” Carolyn Fiddler, communications director for the Democratic Legislative Campaign Committee, told Politico. As the G.O.P. worries that Trump’s drastic drop in the polls will endanger down-ticket races, it has become open season for Obama, who after years of fighting an intransigent Republican majority in the House and Senate is leaping at the opportunity to steal away red seats. “As we exit the stage, to make sure that we’re passing the baton not only to Hillary Clinton, but also to a Congress that is willing to do the people’s business” Obama said at Sunday’s fundraiser, Politico reports.

Democrats’ strategy of tying the dying Trump albatross around Republicans’ necks appears to be working. Recent polling shows a 12-point drop-off in enthusiasm for Trump among his supporters, while the share of registered Republicans who are likely to vote is down 7 points since mid-October. If those trends continue, the question won’t be whether or not Trump will lose, but how much he’ll take the G.O.P. down with him.