Late-night chat show hosts in the US really can't get enough jokes about Kerry and Bush falling from their bikes. Jay Leno's latest dig is a spoof TV ad...

Lance Armstrong for US president!

Ad voiceover:

"On May 2nd, 2 2004, presidential candidate John Kerry fell off his bicycle, and hurt himself. On May 23rd, 2004, President George Bush fell off his bicycle, and hurt himself. Vote Lance Armstrong for president. He knows how to ride a bike."

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