 Relations between the Obamas and the Bidens have never been warm. At times, they've been hostile. But recently, they've deteriorated further, mostly due to Jill Biden. In the hours and days after the debate, she kept her husband cloistered away from anyone who might convince him to drop out. Jill Biden is the driving force behind her husband's reelection campaign, just as she was in 2020 when other members of the family...