evidence: The push to save Biden’s candidacy, which continued Sunday at a Camp David retreat with the president’s family encouraging him to stay in the race, appears to have at least temporarily stemmed the flood of public doubt and bought him some time. Still, the effort by the president’s aides, supporters and family members to contain the damage after he struggled to make a coherent case against Republican rival Donald Trump during the debate has been tumultuous and frenzied. It has also become a case study of a campaign thrust into crisis. [...] House Minority Leader Hakeem Jeffries (D-N.Y.) said on MSNBC’s "The Weekend" that House Democrats are involved in conversations over the future of Biden’s candidacy. He noted that, because the House will be in recess next week for the Fourth of July, those conversations will continue over the phone and virtually. [...] Hours later, deputy campaign manager Rob Flaherty went a step further in a sharply worded memo to supporters aimed at forcefully combating those who have tried to force Biden out of the race.