Captain Crunch leads PPP's survey of "joke candidates."
It is only Clinton's third sit-down interview of the 2016 cycle.
“Personally, I don’t think it should be legal,” the 2016 GOP front-runner said.
Snowden also dismissed comments by Donald Trump, who called him a "traitor."
It's part of a $7 million ad buy in Iowa.
In a distant second place is Ben Carson with 18 percent support.
The Minnesota Republican has announced he will not seek reelection.
Jordan Fabian 09/03/15 11:46 AM EDT
The vice president touted his relationships with world leaders ahead of a possible White House...
Trump said it would be "very tough" for someone with a medical background to be president.
Julian Hattem 09/03/15 11:21 AM EDT
The order could come by the end of next week.