I'll give you a break on question 2 since I'm not sure if any of my links addressed that. National RCV probably doesn't affect national elections in a direct way. However, in an indirect way, if a state (I'll pick on California) has RCV then one party (democrats) can put two candidates up against one for the other party (Republicans) and then in the general election California could then have an election to see which of the two democrats California would vote for for either House and Senate seats, which indirectly and unfairly affects federal elections and could turn a state such as California into a completely blue state, including governorships where the choice is a democrat up against a democrat with no Republicans to even choose from. This could happen in any states, red or blue, which comes back to where I said RCV is just a con to put forth one party rule.