It all makes sense now...
See, he didn't know it was the Star-Spangled Banner they were singing at all his campaign events.

President Bush likes to drop a few words of Spanish in his speeches and act like he's proficient in the language. But he's really not that good, his spokesman said Thursday.

"The president can speak Spanish but not that well," White House press secretary Scott McClellan said. "He's not that good with his Spanish."

(thanks LE)