1. He (imperfectly) insisted that the 11th commandment was, “thou shalt never speak ill of another Republican.”2. While I hated the content of his message, Reagan generally campaigned in an upbeat tone, offering solutions to problems and appealing to the capacity of American people for redemption and change, rather than simply fear and loathing.
3. Reagan gave amnesty to undocumented immigrants, raised taxes multiple
times, dealt with the Iranian regime (illegally), and talked to the
greatest threat of his era – the Soviet Union.
Pretty much any of these would disqualify him in 2016.