He is not registered with a political party, and there are no political donations in his name

James Polk was a Democrat. But he was only nominated because the Democrats couldnt agree on anyone else.

Grover Cleveland was the last and only Democrat president with a mustache.

No, he's a Republican...by name only though. He is closer aligned with the Democratic platform than he is with the Republican platform.

Yes. Not only was he a Democrat, the Democrats had appointed him a Party leader.