Keep in mind Obama crushed McCain by nine points in Colorado.

DENVER — Roughly 1.8 million Coloradans have already voted in the election that concludes Tuesday, according to new numbers from the Colorado Secretary of State’s office.

Republicans continue to hold a slight edge over Democrats in the number of total ballots turned in, but that advantage continues to shrink gradually, more evidence that Colorado is shaping up to be one of the closest swing states on the board.

As of Monday, 624,778 registered Republicans have returned ballots; 590,417 registered Democrats have sent in their ballots, as have 474,437 registered unaffiliated voters.

Republicans have been confident, given their improvement in early voting numbers from four years ago, when Obama crushed Sen. John McCain and went on to win Colorado by nine points, despite McCain winning more voters on Election Day itself.

Republicans are also leading early voting in Colorado’s key swing counties: Jefferson, Arapahoe and Larimer.

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