Like most political threads I've been posting, the POD is John McCain winning the Republican Party presidential nomination in 2000. John McCain's Vice President (the top two names on his shortlist in OTL 2000 were Fred Thompson and Chuck Hagel), are challenged by George W. Bush in 2008 but ultimately win the nomination that year, only to lose to the Democratic nominee. Would Bush try for a third time four years later or would he simply retire? To have him run in 2012, would the POD have to be him not running in 2000, but running for the first time in 2008? I speculated that in such a timeline, Mike Huckabee, Mitt Romney, and Rudy Giuliani wouldn't run in 2008 against McCain's Vice President but would run four years later. So if Bush wins the nomination in 2012 and loses to the Democratic nominee, would 2016 be a bitter fight between Mitt Romney and Jeb Bush?