[whswhs]

One other thing, Alonsua. You postulate that the new party gets 70% of the vote in an election, and elects 70% of Congress. That can work for the House. But in the Senate, only 1/3 of the senators are up for election in any given year. If 70% of them are the new party, that's 23, which isn't anywhere near a majority, and I think it can be counted on that the established parties will team up to block anything coming from the new party in the House. Even in the second election, two years later, you will only get up to 46 senators, still not a majority. So if your new party is going to try to enact anything radical, they will have to sustain support for it for over four years—or conceal anything provocative in their agenda for the same span of time, and then enact it by surprise.