The campaigns of Barack Obama and Mitt Romney have started running new TV ads in Wisconsin.
The narrator opens the Obama spot saying, ""Five hundred and thirty seven. The number of votes that changed the course of American history."
It then features a scene from Florida in 2000 as a newscaster says the state was "too close to call."
"The difference between what was," the narrator says as the spot shows a foreclosure sign, a soldier running, and a picture of former President George W. Bush and Vice President Dick Cheney.
"And what could have been?" "So this year, if you're thinking that your vote doesn't count.That it won't matter. Well, back then, there were probably at least 537 people, who felt the same way. Make your voice heard. Vote."
The Romney ad features footage from this week's presidential debate in which he slams the president for what he has called "an apology tour" and "criticizing America."
"I think they looked at that and saw weakness," Romney says.
The spot continues with Romney's answer from the debate in which he knocks the president for going to Egypt, Saudi Arabi, Turkey and Iraq, but skipping Israel, which Romney calls "our closest friend in the region."
"You said that America had dictated to other nations," Romney says. "Mr. President, America has not dictated to other nations. We have freed other nations from dictators.”