FULL TITLE: Hillary Clinton flies more than 1,000 miles from Iowa to Martha's Vineyard for behind-closed-doors birthday party with Bill, Barack and Michelle America's two foremost Democratic families - the Obamas and the Clintons - mingled on Saturday night as politics mixed with summer repose on swanky Martha's Vineyard. US President Barack Obama, his wife Michelle and their daughters Sasha and Malia, and former president Bill Clinton and his wife, the Democratic presidential front-runner Hillary Rodham Clinton, were star guests at the 80th birthday party for their mutual friend Vernon Jordan. So important was the event deemed to be that...