Biden would be good. He can bring in catholic voters, maybe swinging states like FL or OH.
I tend to disagree. Don't get me wrong because I like Biden. But speaking as a Catholic I don't vote for someone based on religion. In fact I don't know of any Catholic who does vote based on religion. There are some who vote based on view of Roe v Wade, but that's it.
Nor do I know any people like that, but there are some who are like that I am sure. (People are also more likely to vote for someone they like and identify, think Bush's pork rinds and beer image in 2000 and 2004.)
Catholics just don't block-vote the way they once did. There might be a tiny number who do, but they are certainly not going to swing the election; the only 2004 Bush state with an above-average Catholic population is New Mexico. Every other Bush state has a lower percentage of Catholics than the national average.
Strickland, Bayh or Rockefeller, or maybe Manchin. That's pretty much it.