POD: Shriver does not accept his ambassadorship to France, instead returning to private life in Illinois for the time being.
Private life, however, does not last long. Unsatisfied with the incumbent Governor's chances of winning re-election in a decidedly non-Democratic year, Chicago's Mayor Daley meets with Shriver and other high ranking Democratic pols and convinces him to seek the office himself. Defeating the incumbent Governor in a close primary (with the aid of his Kennedy connections), Shriver narrowly goes on to defeat his Republican opponent that fall.
Ted Kennedy dies in the Chappaquiddick incident in 1969, leaving no one as the patriarch of the 'Kennedy clan', though Shriver soon assumes that role in public as well as private. Though he turns down the Vice Presidential spot on the disastrous McGovern-Gravel '72 ticket, he remains popular among white working class and other Democratic coalition voters, enough so that he is re-elected Governor of Illinois in 1972.
By 1976, Governor Shriver is preparing for a Presidential bid. Hubert Humphrey has decided not to seek the White House again, and Henry Jackson comes out as an early supporter of Shriver. With the AFL-CIO and other traditional Democratic groups backing the candidacy of Governor Shriver, he easily clears the Democratic nominating field and defeats incumbent President George H.W. Bush in a landslide.