Well, it can't possibly be common sense kicking in, so I have to wonder what his motivation is:

"You have to stop asking me about a birth certificate," Trump told CNN’s "American Morning" hosts Kiran Chetry and Ali Velshi. "You've got to stop asking the questions."

Trump, who has led numerous GOP presidential polls due, largely, to his beating the birther drum, complained that the issue doesn't allow him to talk about other problems like the trade deficit...

"We'll stop asking you the questions when you stop saying that President Obama can't prove he is born in the United States," Velshi said.

Trump, however, refused to toss away his trump card. "Every day that goes by, I think less and less that he was born in the United States," Trump said. "He possibly was, but I want to get rid of the word 'possibly.' "

In other insanely stupid news, Donald Trump is mad that Jerry Seinfeld backed out of playing a charity benefit hosted by Trump's son Eric. (Seinfeld's manager specifically cited Trump's "demagoguery" as the reason.) Trump fired back with a lame insult about appearing on Seinfeld's failed reality TV show, thereby elevating political discourse for the twenty-eighth straight day in a row.