I think all the talk about who started it is a little misguided. It almost certainly wasn’t the Clinton campaign, but it may have been started by Clinton supporters. However, it was a legit question in spring of 2008. There was a point where it was no longer a legit question. In my mind the absolute drop dead date for me to consider someone arguing birtherism is October 31, 2008 when Dr. Fukino at the request of Governor Lingle stated unequivocally that she had personally seen proof that Obama was born in Hawaii. Maybe you put that drop dead date in 2011. Here’s some Trump statements way beyond the point where this was a legit question…
“He didn’t know he was running for president, so he told the truth. The literary agent wrote down what he said … He said he was born in Kenya and raised in Indonesia … Now they’re saying it was a mistake. Just like his Kenyan grandmother said he was born in Kenya, and she pointed down the road to the hospital, and after people started screaming at her, she said, ‘Oh, I mean Hawaii.’ Give me a break.” May 2012
“A lot of people do not think it was an authentic certificate. … Many people do not think it was authentic. His mother was not in the hospital. There are many other things that came out. And frankly if you would report it accurately I think you’d probably get better ratings than you’re getting.” May 2012
“An ‘extremely credible source’ has called my office and told me that @BarackObama’s birth certificate is a fraud.” August 2012
“Was it a birth certificate? You tell me. Some people say that was not his birth certificate. Maybe it was, maybe it wasn’t. I’m saying I don’t know. Nobody knows.” August 2013
“How amazing, the State Health Director who verified copies of Obama’s ‘birth certificate’ died in plane crash today. All others lived.” December 2013
“Well, I don’t know – did he do it? … Well, a lot of people don’t agree with you and a lot of people feel it wasn’t a proper certificate.” May 2014
“There are three things that could happen. And one of them did happen. He was perhaps born in Kenya. Very simple, OK? He was perhaps born in this country. But said he was born in Kenya because if you say you were born in Kenya, you got aid and you got into colleges. People were doing that. So perhaps he was born in this country, and that has a very big chance. Or, you know, who knows?” May 2014
“Who knows about Obama? … Who knows, who knows? Who cares right now?.. I have my own theory on Obama. Someday I will write a book, I will do another book, and it will do very successfully.” January 2016
I’m sure I could find more. Birtherism in spring 2008 is vastly different from birtherism in 2016.