Well, there’s no “official” Catholic guide to the candidates–and I’m not sure there’s any unofficial ones either. The best I could find is this:
However, the only Democrats it evaluates are Biden, Sanders, and Warren–and I also must confess I find a good number of its ratings dubious (a 5/5 for Trump’s stance on immigration?)
Beyond that, the closest thing you’ll find to an “official” voter’s guide is the following document put out by the USCCB, which is only general advice rather than anything about specific candidates:
Well, this is a separate question. Earlier you were asking about the primary, now you’re presumably asking about the general election, because one doesn’t support Independents or Libertarians in the Democratic/Republican primaries!
In my view, for whatever issues the above unofficial “guide” may have, it’s dead right in that the candidate most aligned with Catholic values is Brian Carroll, though in California he’ll only be available as a write-in this year due to California’s very harsh ballot access laws.