Vitruvius
Donor
Who do you suspect could be a suitable claimant for the Protestant side, in opposition to whatever Spanish-backed Habsburg the Catholics decide to rally around?
The Danish might actually accomplish some of their goals here, if the Catholics are occupied in Austria and Bohemia.
I'm not sure, I don't even think that's terribly likely merely a possible outcome. I guess I was thinking that if Frederick gets Bohemia and pulls the abdication stunt he could vote for John George. Its tricky because the calvinists aren't exactly on the best terms with the moderate Lutherans. So some Lutheran princes may throw their support behind a Catholic before a Calvinist prince. I think you'd need Spain to really agitate the protestants across Germany.
Maybe if Frederick gets Bohemia and Spain invades the Palatinate in retaliation as its easier to attack him there than in Bohemia. Since Frederick is not under a ban such an attack would really rile up the protestants across Germany. Then the Habsburgs insist on a Habsburg pretender to Bohemia casting it's vote and show up to Frankfurt with armed guards. Not willing to see the HRE become a Spanish Catholic client state John George steps up as candidate and Frederick pulls an abdication stunt to get the extra vote. The Catholic electors then decamp to some other city, probably Regensburg or maybe Aachen and have a counter election. It's plausible but I don't know how likely it is compared to a failed election and an interregnum. There might be a fight in Nuremberg over the Imperial Regalia as possessing them might be worth something while a symbolic coronation in Aachen might be used to add the air of legitimacy.
There is a precedent for this - notably the election that saw Ludwig IV become emperor. It was disputed who was the "rightful" king of Bohemia, Heinrich of Carinthia of Jan of Luxemburg, and the one side wound up electing Ludwig, one elected Friedrich of Habsburg. Despite the fact that the election was contested, IIRC no one actually argued that Ludwig wasn't emperor.
True but that was before the Golden Bull of 1356 which more tightly regulated the Imperial Elections. Plus they had to fight it out until essentially come to terms with each other. I have to check but I think the other Electors have the ability to admit or refuse to admit another Elector into the assembly of Electors. I think this was related to their privilege of being able to self assemble without requiring the Emperor's assent.
In 1619 IIRC the Electors, save for Frederick's representatives, refused to admit representatives from the Bohemian Estates who were essentially also Frederick's representatives, and instead acknowledged Ferdinand. Of course that was in the context of Frederick being a usurper in many people's eyes so a more legitimate Election might garner him some support. Then it's unclear what happens if the remaining Electors split 3-3 on who to recognize as King of Bohemia. I'll try and look through Wilson or Whaley for details. I think I still have a copy of Heer's book somewhere too so one of them will probably spell it out.