Donald J. Trump seems to be patterning his administration on the Eisenhower model, and why not? Neither man was a professional politician. Trump is a businessman, a successful real estate developer and television entrepreneur, Eisenhower was a soldier, a victorious wartime commander and president of Columbia University. Both men were caricatured as unsuited to the presidency and, well, dumb. Similarities abound. The big difference is temperament. Ike had his genial grin. Trump has his imperious scowl and his Twitter account. As did Eisenhower, Trump is populating his cabinet – its most important positions, at least – with men who made…