Herman Cain and Frank Luntz (Jason Horowitz, Washington Post)

Former presidential candidate Herman Cain, making his way through the convention hall, took a break from eating an oatmeal cookie to hug Republican pollster Frank Luntz and shout, "My brother from another mother."

Cain isn't speaking at the convention, but he's been giving interviews and talking to delegates here in Tampa.

The billionaire libertarian Koch brothers are also Cain's brothers from another mother, the former pizza magnate said in 2011.