Changes

In 2008, John McCain won the nomination by capturing the support of 1 and 4 above.  Ron Paul had the support of 2.  Mitt Romney enjoyed support by 2 and part of 3.  Mike Huckabee had support of 1 and part of 3.  The division of 3 by Romney and Huckabee caused them to block either other:  Huckabee blocked Romney in Iowa, and Romney returned the favor in New Hampshire.  This dynamic prevented either from winning the nomination.

In 2008, John McCain won the nomination by capturing the support of 1 and 4 above.  Ron Paul had the support of 2.  Mitt Romney enjoyed support by 2 and part of 3.  Mike Huckabee had support of 1 and part of 3.  The division of 3 by Romney and Huckabee caused them to block either other:  Huckabee blocked Romney in Iowa, and Romney returned the favor in New Hampshire.  This dynamic prevented either from winning the nomination.

In 2000, George Bush won with the support of 1 and 3.

In 2000, George Bush won with the support of 1 and 3.  But John McCain enjoyed the support from 2 and 4 and this enabled him to win the New Hampshire and Michigan primaries, giving Bush a close contest.  Some felt McCain mishandled his victory in Michigan.

In 1980, Ronald Reagan had the support of 1 and 2.

In 1980, Ronald Reagan had the support of 1 and 2.