In the sandbox Obama, Gates, and others flew around on the Osprey multiple times.
Lets also remember the ships assigned to HMX-1 have only been in operational for a couple of months, and this was the actual debut of service. Would be hard for him to have taken one on a routine stateside flight.
Plus if his normal cadre of VH-3 and VH-60 are available, why would he be flying the V-22s that dont have all the secret-squirrel presidential comms and equipment aboard?