Republican presidential hopefuls will line up on August 23 for the first round of primary debates. For conservatives who lived through the late 1970s and the 1980s, Ronald Reagan set a standard for how to behave as a candidate and then how to lead as a president. What were the traits and accomplishments that made Reagan the model for many subsequent GOP candidates? For me, six come to mind. First, he could win elections. It may sound trite, but the first important test for any political candidate is the ability to win. It is even more important to win reelection,...