Speculated on everyone from Joe Lieberman to Clint Eastwood.
Maybe it's Sarah? Maybe she's traveling? We can always hope!
Earlier today I read something about Eastwood possibly attending.
“Get off the White House Lawn!”
http://townhall.com/tipsheet/guybenson/2012/08/29/exclusive_clint_eastwood_headed_to_tampa_for_rnc
I think it has already been confirmed it’s Eastwood.