Well, thought I'd review what is known about OTL's future Presidents, Vice Presidents, and major candidates for both offices.
Ronald Reagan: Left the California Governor's Mansion as per OTL, ran for and won the GOP nomination for POTUS in 1976. Lost the election to George Wallace by the narrowest of margins. Currently the presumptive front-runner to win the Republican nomination in 1980.
George H.W. Bush: Was Secretary of State during the Agnew Administration and the first bit of the Gavin Administration. After failing to gain much traction in the 1976 GOP primaries and dropping out pretty early, he's regained his political relevance by being elected Governor of Texas in 1978.
Jimmy Carter: Currently the freshman Senator from the great state of Georgia.
Walter Mondale: After running afoul of Wallace for challenging Briscoe's nomination to Energy Secretary, he lost reelection in the 1978 midterms.
Geraldine Ferraro: Status unknown.
Michael Dukakis: Status unknown (though we do know he couldn't have been elected to his first term as Massachusetts Governor in 1974, as Tip O'Neill won that).
Lloyd Bentsen: Senator from Texas.
Dan Quayle: Got in some trouble with the military for essentially mutinying when he was in 'Nam. Political career doubtful (unless he, ironically, goes far left).
Bill Clinton: Was elected as a Representative from Arkansas in the last midterms... as a Republican!
Al Gore: Has a promising career in broadcast journalism ahead of him.
Ross Perot: Status unknown.
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Bob Dole: Lost reelection in the Democratic landslide that was the 1974 midterms, but returned to the Senate after the 1978 elections.
Jack Kemp: Narrowly lost the 1978 New York gubernatorial election.
George W. Bush: Has a promising career in Hollywood ahead of him.
Dick Cheney: After working for the Agnew Administration, is now associated with Hughes Network.
Joe Lieberman: Status unknown.
Ralph Nader: Status unknown.
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John Kerry: A leading member of Veterans Against the Vietnam War, he lost narrowly to Donald Dwight in 1974 in the Massachusetts 8th.
John Edwards: Status unknown.
Barack Obama: Seems to be a college professor/author in the present day.
Joe Biden: Has become the Harold Stassen of Delaware politics.
John McCain: Had some Not Fun times in a Chinese prison.
Sarah Palin: Drew gave us a huge spoiler early on when he told us that he's drawn toward a Sarah Palin/Christine O'Donnell ticket. Make of that what you will.