democrats or republicans?

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There does not appear to be any difference between D's and R's. Both in promises and performances. If multiple political parties are permitted, there will be political buy-sell, and the cure may be worse than the disease. Can a third political party which is "clean and honest" can ever replace either D or R.? What is the hurdle in building a sincere political party which can say "no" to voters, when the answer should be "NO"?