Obama, Biden endorse Murphy in Florida Dem Senate primary
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President Obama and Vice President Biden are throwing their considerable weight into Florida’s contentious Democratic Senate primary, endorsing Rep. Patrick Murphy (D-Fla.), his campaign announced Wednesday.

Obama and Biden’s involvement amounts to a full-court press by the Democratic Party establishment on behalf of Murphy, who is running against liberal firebrand Rep. Alan GraysonAlan Mark GraysonFlorida's Darren Soto fends off Dem challenge from Alan Grayson Live results: Arizona and Florida hold primaries The Hill's Morning Report: Frustration mounts as Republicans blow up tax message MORE (D-Fla.)

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The president called Murphy “a tireless champion for middle-class families” in a statement from the lawmaker’s campaign.

“I am proud to endorse Congressman Patrick Murphy for the United States Senate,” Obama said. “Floridians can count on Patrick Murphy to stand up for them every day as their next senator.”

Biden is set to campaign with Murphy in the Sunshine State on March 28.

While Obama has not made a public endorsement in the Democratic presidential race, the Florida primary serves as a proxy battle for that race. Murphy supports former Secretary of State Hillary ClintonHillary Diane Rodham ClintonFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Harris adds key Clinton aide, women of color to 2020 campaign: report Democrats more likely Trump's foil, than to foil Trump MORE, while Grayson backs Sen. Bernie SandersBernard (Bernie) SandersBernie Sanders to sign pledge affirming he will run as a Democrat Overnight Health Care — Presented by National Taxpayers Union — Drug pricing fight centers on insulin | Florida governor working with Trump to import cheaper drugs | Dems blast proposed ObamaCare changes Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon MORE (I-Vt.)

The presidential endorsement is intended to be a shot in the arm for Murphy, who is running behind Grayson for a swing Senate seat being vacated by Republican presidential candidate Marco RubioMarco Antonio RubioThe Hill's 12:30 Report: Trump escalates fight with NY Times The Hill's Morning Report - Can Bernie recapture 2016 magic? Venezuela puts spotlight on Rubio MORE.

It comes one day after a Public Policy Polling survey showed Grayson leading Murphy 32 percent to 22 percent, though 45 percent of likely Democratic primary voters say they are undecided.

Republicans called the timing of Obama and Biden's involvement, one day after the poll's release, a sign that Democrats are concerned about the strength of Murphy's campaign. 

“Murphy's Washington handlers are hitting the panic button," said Greg Blair, a spokesman for the National Republican Senatorial Committee. "This is a candidate who has no credibility with his own party's base and the Democrat establishment is doing everything in its power to prop him up.”

Many top Democrats are hoping to end the bruising primary race to preserve their chances of winning in the general election.

Grayson has faced pressure to drop out of the race amid months of scrutiny over his business activities.

Senate Minority Leader Harry ReidHarry Mason ReidSanders hires veteran progressive operative to manage 2020 bid Constitutional conservatives need to oppose the national emergency Klobuchar: 'I don't remember' conversation with Reid over alleged staff mistreatment MORE (D-Nev.) last week called on Grayson to quit the campaign. He cast doubt on Grayson’s progressive bonafides and questioned the Florida congressman’s “moral compass" based on his handling of his hedge fund.

“These deeply troubling allegations should disqualify anyone from a seat in the U.S. Senate,” Reid said in a statement.

The Nevada senator accused Grayson of using his Senate office to unethically promote his Cayman Island hedge fund. The call came one day after The New York Times revealed top Grayson aides have urged him to shutter the fund, which he opened in 2011.

Grayson on Friday denied Reid's claims about the hedge fund and refused to drop out of the race.

"Sen. Reid may well prefer corrupt establishment errand boy Patrick Murphy, who routinely sells his vote to Wall Street lobbyists, and just last week hid from voting on his own bill providing amnesty to white-collar criminals," he said in a statement.

This report was updated at 11:44 a.m.