Then perhaps the U.S. needs a more party-centric proportional representation electoral system, with less focus on individual candidates and more on the party. T

Then perhaps the U.S. needs a more party-centric proportional representation electoral system, with less focus on individual candidates and more on the party. Then it will be the party that's responsible. However, you also need proportional representation, so you can actually have multiple parties. Otherwise, the "other" big party can just "wait its turn" to win the elections again - it doesn't have to prove anything.