Some may call them campaigns, but for David Plouffe, a political adviser to President Obama, they are “brass-knuckle time.” WASHINGTON — David Plouffe is not a hugger, crier or someone who gets all gaga every time he walks into his West Wing office, just a few feet from that of the president. He disdains doomsayers as “bed-wetters,” press hordes as “jackals” and the political noise machine as a profanity that begins with “cluster.” A one-stop destination for the latest political news — from The Times and other top sources. Plus opinion, polls, campaign data and video. David Plouffe “is the one most in tune with the president's personality,” a colleague says. Fiercely data-driven, Mr. Plouffe revels in the company of spreadsheets, lists, maps and the Baseball Almanac. Fiercely competitive, he once decked a colleague in a friendly touch football game for taunting him. Fiercely unsentimental, he expends zero amazement over his career climb from selling knives door to door to a first-among-equals status in the White House’s closed circle. Mr. Plouffe, 44, who managed President Obama’s campaign in the relatively dewy-eyed days of 2008, rejoined his team last year after a lucrative hiatus. Since then, he has asserted himself as the main orchestrator of the White House message, political strategy and day-to-day presentation of the candidate. If the campaign of four years ago sold Mr. Obama as a force for what Mr. Plouffe called “a politics of unity, hope and common purpose,” this one is rooted firmly in the grind-it-out imperatives of re-election. Today, Mr. Obama seems every bit primed for “brass-knuckle time,” as Mr. Plouffe once termed campaign brawling, with Mr. Plouffe leading an effort that has shown every sign of doing whatever it takes to succeed. This month, with Mr. Plouffe’s support, Mr. Obama ditched his long opposition to directing his campaign donors to “super PACs” — outside groups whose bankrolling of negative advertising against his Republican rivals has done much to change politics, and not in a “unity, hope and common purpose” kind of way. Mr. Plouffe (pronounced Pluff) has also pushed for a more combative White House stance toward Congressional Republicans and an aggressive early tack against former Gov. Mitt Romney of Massachusetts, whom the Obama team still views as its most likely and most formidable opponent in November. It was Mr. Plouffe who declared on “Meet the Press” last fall that Mr. Romney had “no core.” Intense and self-contained, Mr. Plouffe, who declined to be interviewed for this article, is a temperament alter ego to a president who has always been drawn to loyal fixer types. Mr. Obama, whose favorite movie is “The Godfather,” has compared Mr. Plouffe to a character — a relentless cop played by Mark Wahlberg — in the more recent mob film “The Departed.” Mr. Obama’s aides are hesitant about discussing the frequency of Mr. Plouffe’s dealings with the re-election effort led by Jim Messina in Chicago, presumably not wanting to suggest he is running the campaign from the White House. Likewise, they are reluctant to characterize Mr. Plouffe’s relationship with the president as special, or suggest that it trumps that of other top lieutenants, particularly Jacob J. Lew, the new chief of staff (Mr. Plouffe is a stickler for hierarchy). But people inside Mr. Obama’s political apparatus say Mr. Plouffe is most in tune with the president’s thinking in terms of his unsparing focus on the middle class and his abandonment of the bipartisan bridge-building efforts that have mostly failed through his first term. “The president probably took David’s opinion with more certitude than he did anybody else’s,” said William M. Daley, who left as chief of staff last month after a year in the White House. “If David said X, I think the president would more often believe X than challenge it.” Mr. Daley added that Mr. Obama would be more likely to heed Mr. Plouffe’s advice than his or that of other longtime confidants, the senior advisers Valerie Jarrett and Pete Rouse. Mr. Plouffe’s history with the president ensures him a rarified place in any Obama endeavor. He became a folk hero within the grass-roots network in 2008, his sleep-deprived face and deadpan delivery evoking urgency (and twiggy frame crying out for cheeseburgers). Mr. Plouffe approaches campaigns with a tribal sense of good-vs.-evil, rarely seeing much humanity in opponents. (He assumed that Hillary Rodham Clinton’s crying episode before the New Hampshire primary in 2008 was “deviously contrived and staged,” he wrote in his campaign memoir, “The Audacity to Win.”)