… According to a CNN analysis from December, the only president in the last 70 years who was more beloved among members of his own party (as measured before the New Hampshire primary) was Dwight Eisenhower in 1956. And this is important because the only presidents who faced muscular primary challenges in the modern primary era were all under 75 percent approval with members of their own party: Gerald Ford in 1976, Jimmy Carter in 1980 and George H.W. Bush in 1992. CONT.
Nathaniel Rakich, FiveThirtyEight