George F. Will maintains that if you want to know if you are a conservative, ask yourself who you would have voted for in 1912.

And if the answer is Taft, you are a conservative.

It's an interesting article worth reading and with some good points.  Will argues that Taft was the last U.S. President who conceived of his role as being one seriously defined and constrained by the Constitution.  He also notes, as well he should, that Taft's record in the Progressive Era was arguably more successful, in Progressive terms, than either Theodore Roosevelt's or Woodrow Wilson's, both of whom defined themselves as Progressives.