CNN has an interesting article titled Why Obama is not first 'imposter' president and won't be the last. No matter what proof is offered, some people will refuse to believe that President Obama was born in the United States. All evidence will be rejected and they will believe in a conspiracy theory instead.
Sadly, this is not new. Many presidents have had their right to hold the office questioned. Hence, this intresting article at CNN by John Blake.
From the article:
You can go back to the 19th century, where calling a president illegitimate was a common -- and often nasty -- practice, says Thomas Alan Schwartz, a presidential historian at Vanderbilt University in Tennessee.
President John Tyler was known as "His Accidency" because in 1841 he became the first president to assume office due to the death of his predecessor.
Rutherford B. Hayes was dubbed "His Fraudulency" because he assumed office after losing the popular vote in 1876 in a disputed election that he won by one electoral vote.
Though questioning a president's legitimacy is common, it can turn dangerous, Schwartz says.
"On the extreme side, it encourages nut cases to take the law in their own hand."