How do you propose achieving RCV without taking over the 2 major parties through their primaries? Honest question. Voting for 3rd parties in the general isn’t achieving that goal. Not voting only tells the majors parties and incumbents you don’t have an opinion they have to listen to because one of them will still win without it. You’re never going to get a watershed shift to the left by focusing only on the presidential race with a third party. Bernie’s Democratic party primary campaigns did more for the left than 3rd parties have done in the last 50 years (no 3rd party presidential candidate since Wallace in 68 has received a single electoral vote) by getting more progressives to run in Democratic primaries.