Here's a great source with pics, links and further information:
http://www.fortliberty.org/hollywood/actors.shtml
(some on this list may not exactly be republican but support the troops or are libertarian)
Charlton Heston
James Woods
James Reynolds
Bruce Willis
Bo Derek
Clink Eastwood (should be Clint...lol)
Patricia Heaton
Rick Schroeder
Ann-Margaret
Emma Caulfield
Pat Sajak
Arnold Scwarzenegger
Lisa Kennedy
Tom Selleck
Jesse Ventura
Shannen Doherty
R. Lee Ermey
Kim Serafin
James Earl Jones
Cheryl Ladd
John Malkovich
Heather Locklear
Drew Carey
Kurt Russel
Barret Swatek
Tracy Scoggins
Edward Hermann
John Larroqutte
Denis Leary
David Ruprecht
Aaron Russo
Chuck Norris
Gerald McRaney
Fred Thompson
Kelsy Grammer
John Gavin
Delta Burke
Tony Danza
Robert Klein
Johnny Grant
Richard Lee Jackson
Johnathan Jackson
Fred Grandy
Connie Stevens
Dixie Carter
Jimmie "JJ" Walker
Dale Dye
Jim Nantz
Bob Gale
Adam Sandler
Micheal Moriarty
Robert Duvall
Glenn Ford
Danny Aiello
Gary Sinise
Jerry Doyle
Denzel Washington