text:  It's not easy to do. The rules would mandate that the president back away from the nomination before August 7th. That's when Democrats officially lock in their delegates. Even swing district Democrats are sticking by Mr. Biden for now. Former House Majority Whip Jim Clyburn saved President Biden's fortunes in the South Carolina primary four years ago. Clyburn laughed when I asked if his services were needed to come to the rescue again.