Leading presidential adviser cites “family” as reason but resigns under cloud.
“I ran out of money,” Snow said.
He had taken a pay cut from his private-sector job to work in the White House.
Karl Rove, a senior White House adviser, left on Friday after he had announced his intention to resign earlier this year.
White House counsellor Dan Bartlett, who like Rove is a longtime Bush adviser from Texas, left earlier in 2007.