Not to split the hair too thin, but we are not a "democratic republic", but a representative republic. We used to not even directly vote for our senators until after the 17th amendment passed in 1913. Prior to that, state legislatures selected our senators. If that were still the case, we would likely have a larger R senate majority today. We have changed the way we elect our leaders in the past, but any current attempt to amend out constitution is a high hurdle to clear. Being fairly evenly divided, and needing 38 state legislatures to agree to an amendment today, it simply isn't going to happen in the foreseeable future. But, it is OK to dream.