Madonna gets booed at concert after urging fans to vote for Obama..

Some fans walked out...

NEW ORLEANS (AP) -- Madonna drew boos and triggered a walkout by several concertgoers after she touted President Barack Obama on her "MDNA Tour" in New Orleans.

The Material Girl asked during Saturday night's performance: "Who's registered to vote?" She added: "I don't care who you vote for as long as you vote for Obama." Drawing boos...