While the Republican Party has never nominated a Catholic for president, no Democrat has been elected president in the last 60 years without having the support of at least a plurality of Catholic voters, as measured by either an exit poll or Gallup's last preelection poll. In 1960, the last Gallup poll before the election showed John F. Kennedy leading Republican candidate Richard Nixon 78% to 22% among Catholics. Kennedy became the first Catholic president. In 12 of the 14 elections since then, the candidate who won the Catholic vote also won the White House. And Republicans Richard Nixon and...