Be careful what you wish for. IF a mega tsunami occurred, it would do flood damage in DC, but would wipe out large areas of Florida, coastal Georgia, North and South Carolina, Virginia and points north. Also probably major damage to parts of Mississippi, Alabama, Louisiana and Texas.
One of the things that was pointed out by angry Republican Congresspeople from NJ and NY is that those states pay more to the federal government than they get back, whereas a number of the states I mentioned get back more than they pay in. I think that DC taxpayers may pay more than thy get back too, but will have to verify.
A tsunami with the right trajectory and enough energy could erase coastal cities like LA.