http://www.nbcnewyork.com/news/local/President-Obama-Credit-Card-Denied-New-York-City-Restaurant-279584042.html?_osource=SocialFlowFB_NYBrand
Obama said he tried to explain to the waitress that his card was valid, saying, "I've been paying my bills," to no avail.
"It turned out, I guess, I don't use it enough ... so they thought there was some fraud going on," Obama said, shrugging. "Fortunately, Michelle had hers."