What ever happened to the Obama birther movement?

Remember the Obama birther movement?

For years the president's critics doubted his eligibility for the position, claiming he was born in Kenya and could not be a natural born citizen. There were even billboards demanding to see his birth certificate. The controversy gained enough traction that President Obama released a detailed version of his birth certificate on the Internet.

Now, nearly seven years into his presidency, the birther movement has lost some of its luster. The president is on the ground in his father's ancestral home of Kenya, and many conservative representatives seem to have forgotten about their old obsession. But not Arizona Sheriff Joe Arpaio.

"We're working on a fraudulent, forged government document," Arpaio told CNN's Jake Tapper.

And Arpaio isn't alone. According to a 2014 YouGov poll, 15 percent of Americans 'know for sure' the president wasn't born in the United States.

See photos of President Obama's arrival in Kenya: