If Katy supported Obama, contender Mitt Romney has found a supporter in Kid Rock.
Stevie Wonder, who has given Hollywood dome of its best songs, came in full support of Barack Obama.
He gave a surprise concert at a packed rally for Obama in Cincinnati.
He also made an unannounced visit to Cleveland, where he did a street concert for a small crowd of 50 people.
Celebrities are trying their best to garner support for their favorite candidate.
On the other hand, Bruce Springsteen added pop to Obama's rally in Wisconsin.
Singer Katy Perry performed at a campaign rally for US President Barack Obama. The singer showed her support by wearing a white dress which had written Vote for Obama.
Clad in blue jeans and shirt, the singer put forth some of his favourites during the rally.
He performed at a rally in Manchester for Republican candidate Mitt Romney.
Barack Obama spotted with Bruce Springsteen.
Rocker Meat Loaf performed for his favourite Mitt Romney in Ohio during a campaign rally.
Katy has surpassed all other celebrities in supporting Barack Obama for Presidential elections. She did not just perform once but thrice for Barack.
Apart from Wisconsin, the singer also performed in Las Vegas at a rally.