Here is a list of when the presidential candidate rolled out their running mates -- and how close it was to the party convention.
2008
Barack Obama
Joe Biden
Announced on August 23, two days before the convention
John McCain
Sarah Palin
Announced on August 29, three days before the convention
2004
John Kerry
John Edwards
Announced on July 6, 20 days before the convention
George W. Bush
Dick Cheney
Kept Cheney as his running mate
2000
Al Gore
Joe Lieberman
Announced on August 7, seven days before the convention
George W. Bush
Dick Cheney
Announced on July 25, six days before the convention
1996
Bill Clinton
Al Gore
Kept Gore on the ticket
Bob Dole
Jack Kemp
Announced on August 10, two days before the convention
1992
Bill Clinton
Al Gore
Announced on July 9, four days before the convention
George H.W. Bush
Dan Quayle
Kept Quayle on the ticket
1988
Mike Dukakis
Lloyd Bentsen
Announced on July 12, six days before the convention
George H.W. Bush
Dan Quayle
Announced on August 8, the second day of the convention
1984
Walter Mondale
Geraldine Ferraro
Announced on July 12, four days before the convention
Ronald Reagan
George H.W. Bush
Kept Bush on the ticket
1980
Jimmy Carter
Walter Mondale
Kept Mondale on the ticket
Ronald Reagan
George H.W. Bush
Announced on July 16, the third day of the convention
1976
Jimmy Carter
Walter Mondale
Announced on July 15, the last day of the convention
Gerald Ford
Bob Dole
Announced on August 19, the last day of the convention
1972
George McGovern
Thomas Eagleton (announced on July 13 -- the last day of the convention; He withdrew on July 31)
Sargent Shriver announced new VP pick on August 8 -- 26 days after the convention
Richard Nixon
Spiro Agnew
Kept Agnew on the ticket
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