Four years ago, we Americans did something that not many decades earlier had been considered unthinkable, in electing an African-American to the presidency. That was a milestone, one that even those of us who voted for John McCain could, as I said that very night, take pride in. This year, a ticket with a Mormon and a Catholic on it could make it to the White House. The Mormons and Catholics who were targets of religious bigotry and violence back in the 19th century made a bet on America — that someday America would be truer to its founding principles of tolerance and liberty. They were right: It gets better.