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 George W. Bush -- the two candidates who initially won while losing the Catholic vote -- both came back and won reelection while winning the Catholic vote.
Nixon trailed Hubert Humphrey 33% to 59% among Catholics in the last Gallup poll before the 1968 election. But in the last Gallup poll before the 1972 election, he led George McGovern by 52% to 48% among Catholics.
In 2000, George W. Bush lost the Catholic vote to Al Gore by 50% to 47%, according to the exit poll published by the Pew Research Center. But in 2004, according to the exit poll, Bush won the Catholic vote over Catholic candidate John Kerry by 52% to 47%.
George H.W. Bush had the opposite experience. In 1988, according to the exit poll published by The New York Times, the senior Bush beat Michael Dukakis 52% to 47% among Catholics. But in 1992, the senior Bush trailed Bill Clinton 47% to 35% among Catholics (with Ross Perot at 18%) in the last Gallup poll before he lost the presidency.
In 2008 and 2012, Barack Obama won the Catholic vote over John McCain (54% to 45%) and Mitt Romney (50% to 48%), according to the exit polls published by Pew.
In 2016, Donald Trump won the Catholic vote over Hillary Clinton by 52% to 45%.
This pattern raises an interesting question about this year's election: Will Joe Biden win the Catholic vote and become America's second Catholic president?
Or will he suffer the fate of John Kerry?
Biden often talks of his Catholicism in political settings.
"I'm a practicing Catholic, which, I guess, as a Democrat, is getting harder to be," Biden said at a Jan. 19, 2005 confirmation hearing for Secretary of State nominee Condoleeza Rice.
On April 29, 2007, Biden made a similar statement on NBC's "Meet the Press."
Tim Russert asked him: "You have changed your position on abortion. When you came to the Senate, you believed that Roe v. Wade was not correctly decided, and that you also believe that a right of abortion was not secured by the Constitution. Why did you change your mind?"
"Well, I was 29 years old when I came to the United States Senate, and I have learned a lot," Biden said in response.
"Look, Tim," he continued, "I'm a practicing Catholic, and it is the biggest dilemma for me in terms of comporting my religious and cultural views with my political responsibility."
In other words, Biden had come to believe by 2007 that it was his "political responsibility" to support the legalized killing of an unborn child.
"I still am opposed to public funding of abortion," Biden told Russert in that same 2007 interview.
On his current campaign website, Biden has a page entitled, "Joe Biden's Vision for America."
"I'm a practicing Catholic," Biden says at the top of this page. "I believe faith is a gift. And the first obligation we all have is, 'Love your God,' the second one is, 'Love your neighbor as yourself.' ... 'Treat people with dignity.' Everyone's entitled to dignity, that's a basic tenet in my household."
Elsewhere on his webpage, Biden explains how he is going to treat unborn children.
"As president," it says, "Biden will work to codify Roe v. Wade, and his Justice Department will do everything in its power to stop the rash of state laws that so blatantly violate the constitutional right to an abortion."
Biden, says his website, will restore "federal funding for Planned Parenthood" and "supports repealing the Hyde Amendment," which prohibits federal funding of abortion except in cases of rape, incest or when the life of the mother is endangered.
Biden also plans to give men government documents that say they are women (and vice versa).
"Biden believes every transgender or non-binary person should have the option of changing their gender marker to 'M,' 'F,' or 'X' on government identifications, passports, and other documentation," says his website.
He also hopes to "restore transgender students' access to sports, bathrooms, and locker rooms in accordance with their gender identity."
And his plan for health care "includes covering care related to transitioning -- including gender confirmation surgery."
Whether Joe Biden becomes America's second Catholic president may depend on his ability to persuade fellow Catholics they should vote for a president who supports codifying a right to abortion, forcing taxpayers to fund abortion, letting men declare they are women and providing them with government documentation -- or surgery -- to establish that "fact."
Terence P. Jeffrey is the editor in chief of CNSnews.com.