Probably When it Abandoned the Non-Interventionist Foreign Policy of Sane Men Like Thomas Jefferson, Grover Cleveland, and William Jennings Bryan and Replaced it with the Woodrow Wilson and FDR Policies of Bullshit World Policing, Nation-Building, etc.

What would be my answer to the question, "So, when did the Democratic party show its first sign of becoming the absolute shit-show that we still see today?"....................................................................................................P.S. And let us not forget either that Mr. Wilson also gave us the Federal Reserve System and the income tax (still the two biggest enablers of the permanent warfare state) and that those are two more huge demerits.......For the record.