Let’s face it - the core of the Democrat party has always been Socialistic an Marxist.
That is not historically true. Actually, the Democrats were quite conservative until FDR came under the influence of socialistic academics. Being of weak principles himself, he was easily bent.
Early in the 20th Century, both major parties were influenced by progressivism and populism. Both were mixtures of those influences with conservative, constitutional principles.
However, the "Progressives" always sold tyranny under the lie of "compassion" and "peace."
Woodrow Wilson was a disaster for this nation. Democrat. Self-labeled "Progressive" and Socialist. He proceeded FDR by decades.
Apparently you overlooked Woodrow Wilson, at least with respect to social and economic policy. Wilson was a socialistic academic himself, a Princeton president who wrote books and articles lambasting the Constitution as an anachronistic impediment to his proposed "progressive" agenda. Then, as President of the US, he introduced the country to such novelties (at the time) of a peacetime federal income tax, direct election of the Senate, a Federal Reserve System, and tougher antitrust laws and enforcement.
On foreign policy, though, you could view Wilson as an interventionist war monger, who went far beyond even what most "conservatives" today would embrace.