Snape is my highest suspect at this point. If Filch and Peter are also mafia, then they would be on the same mafia team. But that's a lot more mafia for one team, with so many mafia already dead. I think at least one of them won't be mafia (most likely Peter, but also possibly Filch), which is why lynching Snape is the much better choice at this point. Either way, they definitely need to still be considered.

But what about the second? Well, they could either all be dead (which is possible), or there's another one or two still out there. I'm not as sure of anything on this point, but possible suspects I have for the second mafia:

-Myrtle (wouldn't that be funny)
-Remus (he was defensive of Dudley at first, but did vote for him at the end when it was obvious Dudley was going to be lynched. He also supported me way more quickly than the rest of you people when I pointed to Snape, which either means he's smarter than you all and understood my theory quicker, or he wants the other mafia team eliminated. A bit thin at this point, but something to consider)

I don't really have enough on Dumbledore to say either way.

But first, Snape needs to be lynched. The rest of the above thinking is pretty moot until then.