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By Associated Press

OAK BLUFFS, Mass. — America's two foremost Democratic couples — the Obamas and the Clintons — mingled on Saturday as politics mixed with summer repose on swanky Martha's Vineyard.

President Barack Obama, halfway through his annual two-week getaway on the Massachusetts island, teed off in the afternoon with former President Bill Clinton, trading compliments on the first hole. Later in the day, both presidents were to join Democratic presidential front-runner Hillary Rodham Clinton at another Democratic luminary's birthday party.

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"Good!" said a spry-looking Bill Clinton, wearing light blue pants and a dark shirt, after Obama made his putt on the first hole at Farm Neck Golf Club in Oak Bluffs.

Joining them on the waterside course Saturday were Obama's former trade ambassador, Ron Kirk, and civil rights figure Vernon Jordan, whose birthday party was scheduled for Saturday evening — with Obama and both Clintons on the guest list.

(L-R) Vernon Jordan, former US President Clinton, Ron Kirk and US President Barack Obama walk off a green while golfing at Farm Neck Golf Club August 15, 2015 in Oak Bluffs, Massachusetts on Martha's Vineyard.BRENDAN SMIALOWSKI / AFP - Getty Images

For former President Clinton, the photo-op comes as his wife, Obama's former secretary of state, struggles to demonstrate to the party that her candidacy is as infallible as was once believed. Hillary Rodham Clinton's poll numbers have dipped as criticism of her use of a private email server for government business mounts, leading some Democrats to give a renewed look at Vice President Joe Biden as a potential 2016 challenger to the former first lady.

As the current leader of the Democratic Party, Obama's preference in the race has been the source of intense interest. Obama hasn't tipped his hand, praising both Clinton and Biden effusively. He isn't expected to endorse a candidate in the Democratic primary.

Reporters covering Obama's vacation here were given a brief peek from a distance, with a baseball-capped Obama taking practice shots. But Saturday night's soiree was to take place in private, with a number of other big-name corporate, civil rights and political leaders in attendance to honor the 80-year-old Jordan.

Hillary Rodham Clinton, who also planned to hold campaign fundraisers while on Martha's Vineyard, was to arrive later from Iowa, where on Saturday she insisted she never sent or received emails marked classified through her homebrew email server. She accused her Republican opponents and GOP lawmakers of partisanship as the email affair continued to overshadow her campaign.

Obama and his family vacation every August on Martha's Vineyard, and he's spent most of this year's trip on the golf course, at the beach and dining at the island's upscale restaurants. Obama returns to Washington on Aug. 23.

Later in the month, the Clintons will vacation in the Hamptons in New York, where Clinton also plans to attend fundraisers for her campaign.