Madonna offered a profanity-laced endorsement of Obama at
her concert Monday night, which involved the singer stripping down to
her underwear to reveal the Obama's name written on her body.“You all better vote for fucking Obama okay,” she screamed at the crowd at Washington's Verizon center.

Later in the show, Madonna took off her shirt and pulled down her pants
to show she had “OBAMA” written in all capital letters across her old wrinkled lower
back.“When Obama is in the White House for a second term I'll take it all off,” she threatened to wild screatches and screams from the audience.

She then began singing a slow, whorish version of “Like a Virgin” while wallowing around on a piano top.

Madonna first revealed her body art in early September, during her performance at Yankee stadium in New York.
http://thehill.com/capital-living/in-the-know/258491-madonna-strips-for-obama-offers-profanity-laced-endorsement