(CNN) - Madonna, no stranger to controversy, took a sour jab at Sen. John McCain as she kicked off her "Sticky and Sweet" tour Saturday night.
During a concert in Cardiff, Wales, images of the Arizona senator were shown alongside Nazi leader Adolf Hitler, Zimbabwe's president Robert Mugabe, destruction and global warming on a screen above the singer.
Later, images of Beatles legend John Lennon, fomer vice president Al Gore, Mahatma Ghandi and Sen. Barack Obama were projected onto the screen, according to the Associated Press.
"The comparisons are outrageous, unacceptable and crudely divisive all at the same time. It clearly shows that when it comes to supporting Barack Obama, his fellow worldwide celebrities refuse to consider any smear or attack off limits," said McCain spokesman Tucker Bounds.
Madonna's last tour, "Confessions," also created controversy, after she staged a mock crucification near the Vatican in Rome.
And in July, Madonna's world was rocked by rumors of an affair with Yankee's third basemen Alex "A-rod" Rodriguez, which may have led to his divorce. Both the A-Rod and Madonna camps denied those allegations.
Rumors and controversy aside, Madonna was in usual form: fishnets, bondage outfits, grinding, pole-dancing and break-dancing.