It is very rare that any politician will every pay for a meal as they often will eat at fundraisers when people that attend the fundraiser will pay thousands of dollars to eat with the politician. Obama has shown to be one of the more corrupt politicians (plus him being from the most corrupt city - Chicago) would lead me to believe that he participates in this kind of fundraising more often then most other politicians.

He either made up the story or for some unknown reason decided it was time to pay for something himself