Who is the most anti-Catholic Democratic candidate?

[Alben Barkley]

...Why is Beto an option when he is literally a member of the Catholic Church?

Seriously, literally none of the Democratic candidates could possibly be construed as "anti-Catholic" no matter how hard you stretch it. This isn't 1860 or some s--t. Hell, the Democrats have been going after the Catholic vote since even long before that! Active anti-Catholicisism in the year 2019 would be both totally out of left field and electoral suicide for any candidate in either party, especially the Democratic Party. Catholics are a swing vote group (voted for Obama twice then Trump, narrowly each time) who absolutely no one wants to alienate. Religion in general maters less than in the past for elections, but at the margins the Catholic vote (in particular its relation to the Latino vote) can potentially make a difference, so no Democratic candidate would ever dream of alienating them. Indeed many of the candidates (including the frontrunner, Biden) ARE Catholic. Why would any Democrat want to upend that?

On a historical note, though, I can't resist the irony of pointing out that Harry S. Truman, a freemason (and therefore in a state of mortal sin according to the pope!), managed to set a record for the Catholic vote in 1948!