Curing breast cancer was the topic, burgers and ice cream sundaes on the menu, and lots of pink the attire for a backyard cookout at Joe and Jill Biden’s Washington, D.C. digs — i.e., the Vice President’s residence — on Friday night, which was attended by USA WEEKEND Senior Editor Carol Clurman. Carol says Joe Biden looked natty in a pale pink tie, while Jill glowed (though it could have just been the 80-something-degree heat) in pearls and a fuchsia silk cocktail dress with puffy sleeves. Munching and mingling among the crowd, in town for the Susan G. Komen Race for the Cure on Saturday, were the Bidens’ four darling grandchildren, oblivious to the heat and the brief speechifying by their grandparents. For the Biden family, the occasion was personal. “Twenty years ago, my college roommate’s wife died of breast cancer,” Joe Biden said. And his wife explained, “In the early 1990s, four friends were diagnosed with breast cancer and one of them died.” As a result, she said, she started the Biden Breast Cancer Initiative to educate high school students about early detention. Despite the talk of cancer, the mood was distinctly festive. Country singer Candy Coburn (pictured, right, with Carol), wearing the best shoes of the night — suede, fuchsia platforms with zippers — posed gamely in front of the VP’s house before heading back to her hotel room for the evening. “I’ve got to get up at 6!” to join Jill Biden, Komen’s founder and CEO Nancy Brinker, and 40,000 others for the 5K run around the Washington mall, Coburn said. Afterward, Coburn performed her new single, Pink Warrior, to the crowd. She’s donating all of the royalties to the cause.