So the point is, be careful who you think is a (modern) Repub and a (modern) Dem.
Teddy and Woody were both “progressives” - and president-wise, the perfect tipping point on when one became tyrannical and the other stopped.
The slavery thing really is overblown, and look who beats on it now. So you know likely you shouldn’t be lionizing Lincoln and the rest of the old Republicans, because they love them.
"Otherwise, how did you enjoy the play, Mrs. Lincoln?"
Basically, Nateman has it exactly right, but not every Democrat is 100% Democratic and not every Republican 100% Republican.
Setting aside the Trail of Tears, ("Otherwise...") I count Andrew Jackson as more Republican than Democrat.
Since Day One in 1787 Federalists / Whigs / Republicans are the writers, ratifiers and defenders of the Constitution.
Democrats were the anti-Federalists and since then only ever defend the Constitution when it can be weaponized via "strict-construction" against their opponents.
Otherwise, once themselves in power, Democrats ignore the Constitution.
So, to the degree that, say, an Andrew Jackson or Grover Cleveland actually followed the Constitution, they were not true Democrats, but more like conservative Republicans.