[Campion]

That's actually false. They aren't in schism. They're in a state of impaired communion. Canon law specifically defines schism as "refusal of communion to the Roman pontiff or those in communion with him," which the SSPX doesn't do.

I would have to imagine though that "Catholic/SSPX Caucus" would be extremely offensive to an actual SSPX adherent, because it implies that they are something other than "Catholic".

Sort of how Catholics would feel about a "Catholic/Christian Caucus" designation.

[ebb tide]

I would have to imagine though that "Catholic/SSPX Caucus" would be extremely offensive to an actual SSPX adherent, because it implies that they are something other than "Catholic".

I agree with you; I find the label "Catholic/SSPX" redundant. I was just going by the religion moderator's old forum rules; but I now see they have been changed for the better. From his or her home page:

So I was in error, I am no longer constrained to that particular "caucus" and will stop doing so.

By the way, MurphsLaw recommends traditional Catholic apostatize and join the Orthodox before attend SSPX masses. Apparently she's very confused.