House Democratic leaders are rallying behind Rep. Daniel Lipinski (D-Ill.) as he faces the toughest primary contest in his 14 years on Capitol Hill.

House Minority Leader Nancy Pelosi Nancy PelosiAs families deal with coronavirus, new federal dollars should follow the student Sunday shows - Ruth Bader Ginsburg's death dominates Hypocrisy rules on both sides over replacing Justice Ginsburg MORE (D-Calif.), Minority Whip Steny Hoyer Steny Hamilton HoyerHouse Democrats postpone vote on marijuana decriminalization bill Democrats scramble on COVID-19 relief amid division, Trump surprise The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Md.) and Rep. Joseph Crowley (N.Y.), chairman of the House Democratic Caucus, have all come out vocally in recent days to throw their weight behind the incumbent, a centrist Blue Dog leader being challenged by a liberal anti-bullying activist who’s questioning Lipinski’s Democratic bona fides.

“I support Dan,” Crowley said this week.

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The race has become a flashpoint in the much broader debate over the direction of the party as it seeks to hone its message — and tamp down divisions between liberals and centrists — to win back the House in November’s midterm elections.

Indeed, the high-octane leadership endorsements mark a break with some liberal members of the caucus, including Illinois Reps. Jan Schakowsky Janice (Jan) Danoff SchakowskyAhead of a coronavirus vaccine, Mexico's drug pricing to have far-reaching impacts on Americans With Biden, advocates sense momentum for lifting abortion funding ban Hillicon Valley: Facebook removed over 22 million posts for hate speech in second quarter | Republicans introduce bill to defend universities against hackers targeting COVID-19 research | Facebook's Sandberg backs Harris as VP pick MORE and Luis Gutiérrez, who’ve been highly critical of Lipinski’s positions on health care, abortion, LGBT rights and immigration. They’ve endorsed Marie Newman, Lipinski’s opponent, in hopes of pulling the party to the left.

Fueling the effort, Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.), the populist icon and potential 2020 presidential contender, also endorsed Newman this week.

The contest has also raised questions about the devotion of the Democrats’ campaign arm to the party’s sitting members. While the Democratic Congressional Campaign Committee (DCCC) is now actively backing Lipinski’s bid, the incumbent had told various news outlets in recent weeks that the support was being withheld. The perceived delay in sending resources prompted an outcry from some Blue Dogs, who’ve voiced concerns that the liberal-leaning caucus was giving its centrist members the cold shoulder.

"We Blue Dogs don't understand it. He's an incumbent," one House Democrat told The Hill this week. "Of course the DCCC should endorse him."

A DCCC aide pushed back hard Friday against any suggestion that the group was shunning incumbents of any stripe. DCCC chairman Ben Ray Luján (D-N.M.) created a new branch this cycle — the Member Engagement Department — with four staffers charged with providing political support to all members who seek it, the aide noted.

“Congressman Lipinski is taking this race seriously, he has ample resources and support at home, and is running to win,” Lujan said.

The Democrats are in little danger of losing the Chicago-area district, a safely blue region that supported Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE over President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE by a margin of 15 points in 2016. But the primary race has exposed internal disagreements over how the party can speak more effectively to heartland voters — and boost its fortunes at the polls — while staying true to its liberal base.

Lipinski has ruffled liberal feathers for years with his staunch opposition to abortion, his vote against ObamaCare, repeated efforts to resist an expansion of LGBT rights and his position on immigration, including a vote against the Dream Act in 2010. During the Trump administration, when those issues have risen to prominence and the "Me Too" movement against sexual harassment and assault is sweeping the country, Newman’s liberal supporters say the time is ripe for Lipinski to go.

“The people of Illinois' 3rd district want a pro-health care, pro-immigrant, pro-woman, pro-LGBTQ Member of Congress to represent them in Washington,” Schakowsky said in endorsing Newman. “Unfortunately, the current member does not reflect those values.”

Gutiérrez, for his part, will host an immigration roundtable with Newman on Saturday. And recent polls show the race is tightening. A survey from Public Policy Polling, released this week, shows Lipinksi holding a slim lead, 43 to 41 percent.

Still, Lipinski is a formidable force who’s shown remarkable staying power, despite the shifting winds of his party. He has deep roots in the district, winning the seat that was vacated by his father, Bill Lipinski, who held it for a decade before. And he’s enjoyed the long-standing support of organized labor. Both of Chicago’s major newspapers, the Tribune and the Sun Times, have endorsed him.

The Democratic leaders have given Lipinski more than just their endorsements. Both Hoyer and Crowley have contributed thousands of dollars to Lipinski’s campaign this cycle.

The endorsement from Pelosi is particularly notable. She was the leading force behind the passage of ObamaCare in the House, has been a life-long champion of LGBT rights and access to abortion, the Dream Act was among her last victories as House Speaker, and Lipinski has regularly voted against her in the lower chamber’s biennial leadership races.

Still, Pelosi didn’t hesitate this month when asked if she supported the Illinois Blue Dog.

“Yes, I do,” she said.

The primary contest is scheduled for March 20.

Scott Wong contributed.