Two pieces of evidence to support the headline:
1. His latest campaign ad (below) shows him smoking marijuana. (The bong burbling sound at the end is a nice touch.)
2. On his Facebook page -- the same place where he predicted earning 16 percent of the vote next Tuesday -- he said this about the ad:
"There is no way President Obama is not going to be asked about it on camera and there is no way he will not be able to smile while answering!"
Dude, Andy. Have you ever dipped Cheez-Its in ranch dressing? Uh-MAZE-ing!