A few others to consider:
John Gavin, ambassador
Pat Nixon, bit player in films before marrying Richard M.

Charlton Heston...occasional actor, full time gun lobbyist

Also I seem to recall hearing that Yvonne DeCarlo devoting a small amount of
time to the Johnm Birch Society
And didn't Trotsky once have a small part in a movie??

Online resources for film/TV studies may be found at ScreenSite