By Bob Greene, CNN Contributor
(CNN) - Bob Greene examines how the McGovern and Eagleton Democratic presidential ticket in 1972 would forever change how candidates for vice-president are picked.
[1:17] "Presidential politics is a take-no-prisoners game, and a vice-president is always that one famous heartbeat away from the Oval Office."
CNN Contributor Bob Greene is a bestselling author whose 25 books include "Fraternity: A Journey in Search of Five Presidents" and "Running: A Nixon-McGovern Campaign Journal." He appears on "CNN Newsroom" Sundays during the 5 p.m. (ET) hour.
The opinions expressed in this commentary are solely those of Bob Greene. See all of Bob Greene's columns at CNN Opinion.FULL STORY