[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/POLITICS/10/15/internet.rumors/art.dems.afp.gi.jpg caption="The Democratic presidential campaign of Barack Obama and Joe Biden has dealt with several Internet rumors."]
WASHINGTON (CNN) - Barack Obama is not a Muslim, and John McCain did not tell the television show "60 Minutes" he was a war criminal who intentionally bombed women and children in Vietnam.
Joe Biden is not planning to step aside in favor of Hillary Clinton as vice president, and Sarah Palin did not order books banned from the library when she was mayor of Wasilla, Alaska.
But if you have spent any time browsing the Internet this year, you may have read rumors to the contrary.
All these stories - and more - are being e-mailed to friends and family and posted on blogs.
And they are all false.
Heard that Obama was really born in Kenya and thus not eligible to be president? Wrong.
Heard that Palin was a member of the Alaska Independence Party? Nope, she wasn't.
But these stories are potentially damaging to the presidential campaigns of Obama and McCain, Washington communications expert Ron Bonjean warned, so it is critical to rebut them as firmly as possible.