[Sthitch]

Our founding Father's were mute on how the electors should be chosen, they left that completely to the states. Two states currently split their votes, Maine and Nebraska ((the only unicameral legislature in the country). During the election of 1876, Florida also split their electors based on congressional district, this is what handed the election to Hayes over Tilden.

[TeleStraightShooter]

Our founding Father's were mute on how the electors should be chosen

Initially many states elected congressmen the same way 48 states now choose electors, that is sans districts.

That 1876 election was quite a doozy, The new state of Colorado simply skipped an election and simply appointed the (R) electors.
One could argue if it was "fair", but it was certainly constitutional.