12 key moments in past U.S. election debates

President Barack Obama squares off against Republicanchallenger Mitt Romney in second of three debates on Oct. 16. The high-stakes political sparring match will take place in a town-hall format.

Experts will be watching tosee iftheshowdown can reproduce the fireworks andzingersof U.S. debates past, as seen in the video reelabove. The highlights include:

• A telegenic John F. Kennedy sparring with a sweaty Richard Nixon in 1960. Shortly after winning the presidency, Kennedy said, "It was TV more than anything that turned the tide." Many politicians were afraid of suffering Nixons fate and refused to participate before the cameras. The televised debates wouldnt reappear in the U.S. until 1976 when Georgia Governor Jimmy Carter took on President Gerald Ford .
• Republican vice-presidential candidate Dan Quayle in 1988 saying he had as much experience in Congress as Jack Kennedy when he ran for the presidency. To cheers and applause, Democratic nominee Lloyd Bentsen replied, "Senator, I served with Jack Kennedy, I knew Jack Kennedy, Jack Kennedy was a friend of mine. Senator, you are no Jack Kennedy."
• Ross Perot, George Bush and Bill Clinton in 1992 pledging to quit the mudslinging in favour of debating the issues.
• George W. Bush telling voters in 2000 that he trusts them with their money, while his opponent Al Gore wants to "grow the government."