A State voting pool of a few million pales to a national voting pool of 150 million.
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You’ve yet to answer why a “moderate” presidential candidate can’t win, but a “moderate” senator can. How does the voting pool work in favor of the senator at a state level? If anything, states are more ideologically unique.
To win elections you need to put forth candidates from your party, who can win. People seem to be forgetting the second part of that statement.