What if President Obama resigned?

No, President Obama is not resigning. But what if he did? In light of the news that Italy's Prime Minister Silvio Berlusconi is resigning, I thought it would be interesting to take a look at other world leaders who are or who have already bid farewell to their posts.

There's Prime Minister George Papandreou of Greece, who is sort of beginning the resignation process.

There was Egyptian president Hosni Mubarak, who resigned earlier this year.

And of course, there was Richard "I am not a crook!" Nixon, who resigned his position as the 37th president of the United States of America.