The Speaker can be from the minority party?
It says a lot about the average American that even people who post on politics forums haven't even bothered to read the Constitution.
I'm sorry but I don't see how "The House of Representatives shall chuse their Speaker and other Officers" would, on its own, definitively answer Mr. Bigby's question
There is zero mention of political parties ANYWHERE in the Constitution so why would being in the majority party be a prerequisite for a job outlined in the document?
This is basic Constitution stuff. It doesn't even require reading comprehension.
You brought up the Constitution first. 
Say what you want but there is no party litmus test for the Speaker of the House in the Constitution. When in doubt default to the Constitution. One would think that goes without saying on a politics forum.
I understood Bigby's question to be whether the election of the Speaker requires a majority vote or a simple plurality. The answer to that question is of course nowhere in the Constitution but rather in the House rules.
