The speed at which the White House and press corps are moving the goal posts for what counts as shameful Biden family business is remarkable, though it doesn’t change the facts. House Oversight Committee Chairman James Comer’s release of evidence of family payments to Joe Biden are a problem for the White House, no matter the spin. Mr. Comer has produced images of two checks made out to Joe Biden, both drawn from an account held by his brother James and sister-in-law Sara. Both entangle Joe in his family’s sordid financial dealings and undercut his claims that he knew nothing....