Re: WWYCD: Washington, D.C. is no more.
Riptide: Help with damage control, put together a benefit concert for the victims, offer his services as a superhero to the new President...and secretly try to figure out who the new President is working for. Hm...come to think of he does have a time machine stashed away even though he was reluctant to use it. He might try to reverse it.
The Wizard of Oz Incorporated: Offers to sell the Canadian government a network of active scanners that will insure that nobody can bring fissionable material into Ottawa without being noticed. After that, move on to offering to sell the same technology to many different governments.