A couple more to choose from -
ITEOTWAWKI
'45' (His presidential #)
#1DUDE
MOV'N UP

The United States Secret Service has torn the camouflage off the latest Cadillac DTS presidential limousine in time for President-elect Barack Obama's Inauguration next Tuesday.
The numbers on their navy blue license plates read "44," a nod to the soon-to-be 44th president.

GM also supplied two Cadillac limousines to George W. Bush and one to Bill Clinton, as well as various past presidents over the years.