It's Portman. Will be revealed after Olympics are over (next week).
Speakers at the Republican Convention in Tampa are the Democratic Parties dream lineup:
Note: Keynotes not yet announced.
Florida Gov. Rick Scott - the hosting state's Governor, not invited to speak yet ???
Tea Party Ayn Rand Loonie Rand Paul - yes (he's running for pres 2016)
Conservative Theocratic Dominatrix Rick Santorum - yes
Other speakers:
South Carolina Gov. Nikki Haley
New Mexico Gov. Susana Martinez
Former Secretary of State Condoleezza Rice
Sen. John McCain of Arizona
Former Arkansas Gov. Mike Huckabee.
Ohio Gov. John Kasich