H.L. Mencken was a renowned newspaper columnist for the Baltimore Sun from 1906 until 1948. He was also a Democrat.
He predicted this about the Presidency:
“The Presidency tends, year by year, to go to such men. As democracy is perfected, the office represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart’s desire at last, and the White House will be adorned by a downright moron.”
http://www.washingtonsblog.com/2012/04/h-l-mencken-was-right.html
h/t: Peter