Kitty Kelly's latest trashy book claimed Bush used coke at Camp David, they're playing off that. SNL made fun of Kelly's slander that Nancy cheated on Ronnie with Frank Sinatra, too.
When "troopergate" came out, SNL made fun of that with a skit of governor Clinton going on a ride-along with an AR state trooper, and blackmailing hot chicks pulled over for DUIs to do Clinton in a police car.