I don't understand this focus on the House. If we accept the axiom that 435 representatives can't represent 300M Americans, what are we supposed to think of 10

I don't understand this focus on the House. If we accept the axiom that 435 representatives can't represent 300M Americans, what are we supposed to think of 100 Senators? The federal government was never supposed to be this important. Four-hundred thirty-five representatives only have a hand full of responsibilities outlined in the Constitution. Somehow though they're concerned about who I'm married to and what I grow in my garden. The obvious solution is not to expand representatives, but to push power down to the local level where it belongs.