Why V-22 may not be the VIP bird any time soon.
As I understand some of the requirements and constraints for the VIP bird(s)
1) The aircraft has to have been in service for a number of years (10? don't know why that number comes to mind) so that a track record for reliability is already established
2) The issue of how big a storm/rotorwash vortex gets kicked up by the aircraft on the White House Lawn factors into whether or not it is suitable for that part of the mission ... which may be
PR intensive, but is still part of how the Presidential transport fits into the President's routine.
I think the second point was a factor in H-53 not being eligible? (Not sure where I heard that, it's been a few years). 53E kicks up roughly hurricane force winds in a hover ... and I understand that V-22 kickes up a healthy storm as well.