The first cocktail party at Barack Obama’s new office last month was certainly more casual than any he had hosted in recent years. The wine bore a random assortment of labels, as if assembled potluck-style. The self-serve appetizers were set out in the narrow hallway. The host, tieless, eschewed formal remarks, as a few dozen of his old administration officials — Joe Biden and former chief of staff Denis McDonough, as well as more junior ones — mingled in a minimalist wood-paneled suite that could be mistaken for a boutique law firm.

“It was a bit of a shock to the system,” said Peter Velz, who used to work in the White House communications office. “You’re bumping up right against the vice president as he’s getting cheese from the cheese plate.”

As the dinner hour drew near, the former president exited with a familiar excuse, Velz recalled: “He was joking if he doesn’t get back to Michelle, he’s going to be in trouble.”

So far, Obama is trying to approach his post-presidency in the same way as his cocktail-hosting duties — keeping things low-key, despite clamoring from Democrats for him to do more. “He is enjoying a lower profile where he can relax, reflect and enjoy his family and friends,” said his former senior adviser Valerie Jarrett.

But the unprecedented nature of this particular post-presidency means his respite could be brief. Even while taking downtime at a luxurious resort in the South Pacific last week, Obama put out a statement urging Republicans not to unilaterally dismantle his signature health-care law.

Not only are the Obamas still young and unusually popular for a post-White House couple, but their decision to stay in Washington while their younger daughter finishes high school has also combined with the compulsion of the new Trump administration to keep pulling them back into the spotlight.

President Trump has repeatedly invoked his predecessor to blame him for the “mess” he says he inherited: “jobs pouring out of the country,” “major problems” in the Middle East and North Korea. A post-election show of camaraderie has ended; the two have not spoken since Trump took office.

Trump dropped any remaining veneer of politeness this month with a series of tweets accusing Obama — without offering evidence — of illegally surveilling Trump Tower during the campaign. Obama was privately irritated at the allegation, which the director of the FBI and lawmakers from both parties dismissed as unfounded.

He has attempted to stay above the fray, watching from the sidelines as Republicans have pressed to unravel a slew of his initiatives — and emphasizing the need for a new generation of political leaders to step up in his place.

barack-obamaAnd yet, while other recent ex-presidents have devoted their retirement years to apolitical, do-gooder causes, Obama is gearing up to throw himself into the wonky and highly partisan issue of redistricting, with the goal of reversing the electoral declines Democrats experienced under his watch.

Both the continued interest in Obama and his desire to remain engaged in civic life place him in an unusual position for a former president. George W. Bush left office with low approval rates, retreating to Dallas to write a memoir and take up painting. Bill Clinton decamped for New York on a somewhat higher note politically but downshifted to a mission of building his family’s foundation and supporting his wife’s political career.

Can the Obamas put their heads down and build their ambitious presidential center while living only blocks from the White House? Or is it inevitable that the former president will get pulled back into the political swamp?

In February, Obama attended a Broadway performance of Arthur Miller’s “The Price” along with his elder daughter, Malia, and Jarrett. They slipped into the theater after the lights went down and left before they came up, most of the audience unaware of his presence — until a New York Times reporter sitting in front of him tweeted about it. By the time Obama left, a crowd had gathered outside.

Paparazzi wait outside of the D.C. SoulCycle exercise studio that Michelle Obama frequents, though she clearly does not appear interested in being photographed.

“They are still decompressing from an extremely intense period. It actually started not just eight years ago but really since his 2004 convention speech — and it never let up,” said a former senior West Wing staffer. “It’s like 12 years of extremely intense stress, political activity, scrutiny, responsibility as a national leader, and for the first lady as the surrogate in chief. . . . That’s been a big load for the both of them.”

To escape the spotlight, the Obamas have taken multiple vacations since leaving the White House — to Palm Springs, the Caribbean and Hawaii. After meeting with tech executives about his presidential center recently, Obama headed to Oahu, where he golfed with friends and dined at Buzz’s Lanikai steakhouse in Kailua.

Three days later he jetted off in a Gulfstream G550 to Tetiaroa, a South Pacific island once owned by Marlon Brando. He plans an extended stay there to start writing his White House memoir, according to a person familiar with his plans who asked for anonymity to discuss them.

His whereabouts have been obsessively scrutinized. The conservative Independent Journal Review hinted at some murky connection between Obama’s Oahu visit and a Hawaii federal court ruling putting a temporary stay on Trump’s latest travel ban; the conspiratorial story was later retracted. At a GOP dinner, Rep. Mike Kelly (R-Pa.) declared that Obama stayed in Washington “to run the shadow government that is going to totally upset the new agenda.” (Kelly later played down his claim.)

Trump, meanwhile, has kept his distance. Before he took office, the new president said he intended to seek Obama’s counsel in the future, but he has not. Trump called once to thank Obama for the letter left in his desk, a pleasant tradition among presidents, but Obama was traveling at the time, according to an individual familiar with the exchange. When Obama returned the call, Trump conveyed his thanks through an aide but said there was no need to get Obama on the phone.