Although attention in the presidential campaign now focuses on COVID-19, the economy, the Supreme Court and health care, it is important not to lose sight of the critical role that the faith factor will play in the election outcome. Indeed, after downplaying the role of religion in the 2016 campaign, observers were stunned when GOP nominee Donald Trump pulled off a narrow Electoral College victory with critical help from white evangelical and Catholic voters.
In a narrow election victory, it is possible to attribute the outcome to any one of a number of key voting groups. But consider Trump's unexpected wins in three Great Lakes states - Michigan, Pennsylvania and Wisconsin - were by a mere 80,000 votes combined. His improved showing among white evangelicals and Catholics over Mitt Romney's 2012 numbers in those states was more than the margin of victory in 2016.
Trump's showing among evangelicals was a very big post-election story in 2016. His impressive support from white Catholics did not get so much attention, but was key as well. Going back to the early 1980s until the 2016 election, the national Catholic vote tracked very closely with the overall national popular vote outcome. 2016 is an outlier in that Hillary Rodham Clinton won the popular vote, but Trump won a slight majority of Catholics. This year, Democratic nominee Joe Biden is counting on his Catholic identity to reverse the 2016 outcome among Catholic voters.
How can we then make sense of the religion factor in the 2020 election? First, consider the following voting breakdowns in the voting populations among the one-party-leaning groups:
White evangelical Protestants comprise about one-fifth of the U.S. population and vote overwhelmingly Republican: 81% for Donald Trump (2016), 79% for Mitt Romney (2012), 72% for John McCain (2008), 78% for George W. Bush (2004). Trump is holding very strong support with this group, although with some minor but potentially important slippage from his showing in 2016 with these voters.
Unaffiliated, or the religious "nones," are also about one-fifth of the population and are almost as solidly pro-Democratic as evangelical Protestants are pro-Republican.
Black Protestants - just under 10% of the population - are overwhelmingly pro-Democratic, and surveys have this group giving over 90% support for the Biden-Harris ticket.
Small religious minorities - several percent of the population - mostly are pro-Democratic; these would include Muslims, Jews and a number of Eastern and New Age religious identities. Mormons are the exception as a solidly Republican voting religious group.
Second, other groups divide their support between the major parties to varying degrees:
Mainline Protestants are slightly less than one-fifth of the population and the key determinant for this group is religious practice, not identity. The less religiously observant splits its vote nearly evenly between the major parties in presidential elections, whereas the regular church-attending favor GOP nominees.