A 'Congressional filibuster' is literally redundant filler used to fill time, often in the middle of the night to literally an empty room with no expectation of an audience or even a coherent message. People literally go up there and read Dr. Seuss out loud.

Find someone having reasonably candid dialogue with Bernie Sanders for 2.5 hours - I don't think it exists.

But that would be besides the point - Rogan's format is consistently an order of magnitude longer than others, it's open and generally unedited - this doesn't exist elsewhere.