There’s quite a bit of mythology surrounding the term “Catholic vote,” whenever journalists discuss American politics.

First of all, there’s no such thing as a typical American “Catholic voter.” At the very least, journalists have to probe the sharp divisions between “cultural” Catholics and those who attend Mass on a regular basis.

In the past, I have shared a “Catholic voters” typology that I learned from an elderly priest who had decades of experience in Washington, D.C. I have edited this a bit:

* Ex-Catholics. Solid for Democrats. Cultural conservatives have no chance.

* Cultural Catholics who go to church a few times a year. This may be an "undecided voters" niche, depending on the economy, foreign policy issues, etc. Leans to Democrats.

* Sunday-morning American Catholics. Regulars in the pew and they may fill some parish leadership roles. This is the key “Catholic,” swing voter candidates are chasing.

* “Sweats the details" Catholics who go to confession, are active in full sacramental life of the church and back Catechism on matters of faith and practice. This is a small slice of “Catholic voters.” Solid for GOP.

All of this matters because Catholics, of one kind or another, are 21 percent of the U.S. population and their votes are crucial in swing states such as Ohio and Florida. In the past, Catholics were a crucial part of coalitions that led the Democratic Party.

This brings us to a Washington Post political-desk report about Sen. Kamala Harris throwing her hat into the already crowded field of Democrats seeking their party’s presidential nomination. The headline: “Sen. Kamala Harris formally opens her presidential campaign with a mix of unity and blunt talk about race.”

This is one of those stories in which it is hard to discuss its religion-news contents, because the story contains a large religion-shaped hole, one of special interest to many Catholics. In particular, it is interesting that the story does not contain these words — “Knights of Columbus.” Hold that thought:

OAKLAND, Calif. — Sen. Kamala D. Harris on Sunday formally announced her presidential campaign, merging lofty and unifying lines aimed at a restive Democratic electorate with a blunt discussion of racism, police shootings and the impact of police brutality.

Harris announced on Monday, the Martin Luther King Jr. holiday, that she would seek the presidency. Her appearance in her hometown on Sunday was the ceremonial start, and it became the highest-profile address yet by any presidential candidate.