Roosevelt/Wilkie in 1944, leftist party emerges after WWII?

Defeated in his second bid for the White House, Willkie announced he was returning to the practice of law, but his friends doubted he would be content there. Roosevelt was anxious to dump Vice President Wallace from the ticket in the president's bid for a fourth term, and had an intermediary sound out Willkie about running in Wallace's place. Willkie was reluctant even to respond, knowing Roosevelt had made promises to potential running mates he did not follow through on. There were further discussions between Willkie and the White House, of which third parties were aware though the details are not known; the vice presidential nomination went to Harry S. Truman. Willkie interested Roosevelt in a new, liberal, party, to be formed once peace came, that would combine the left of the two existing major parties, but Willkie broke off contact with the White House after there were leaks to the press, and he felt used for Roosevelt's political gain. Roosevelt sent a letter expressing his regret for the leak, but that too was printed in the papers, and Willkie stated, "I've been lied to for the last time."

Suppose FDR wasn't just stringing Wilkie on. Would this have led to the creation of a united American leftist party?

I actually don't think so, because:

1. Wilkie was a lifelong Democrat who converted to the GOP in 1939. He's not like some Progressive Republican who could bring over others of his stripe into the Democratic Party, during a realignment. Plus, the main issue he shared with FDR was being pro-interventionist.

2. Wilkie dies even earlier than FDR does.
 
The New York Liberal Party actually tried to tap Wilkie as a candidate for NYC mayor to move the party up to the national level. He however died from a heart-attack before then, which if you read about was probably avoidable if Wilkie went to the hospital/lived a healthier lifestyle.

I feel this is a more likely scenario than a FDR/Wilkie ticket with FDR leaving his own party. Other way would be to kick out the Southern Democrats in a new realignment election where the Taftite Republicans pander to the South and the Democratic Party becomes an united liberal party decades earlier.
 
I thought of making a topic on this a while ago. A very fascinating possibility, but with FDR and Wilkie both dying in 1944-45 OTL it's so hard to evaluate.

With a sprinkle of alien space bat pixie dust, they live another ten years or so each. FDR retires after his fourth term and Wilkie becomes Mayor of New York as a liberal, and is endorsed by former Governor and President Roosevelt. They convince liberal Democrats and Republicans to join their party. I could see Hubert Humphrey joining them but a lot of other figures of the era are harder to say for sure. Estes Kefauver is possible. Adlai Stevenson possibly?

This leaves the Democratic and Republican Party dominated by moderates and conservatives, with the latter often more northern pro-business figures and the former more dominated by traditional southerners.

Eisenhower's a tough man to beat, but without him, I could see Wilkie winning in 1952 as the Liberal nominee, against a southern dem and probably Robert Taft. 1948 feels too early for FDR to jump ship, as a retiring president, unless the Dems explicitly nominate someone who turns their back on him.
 
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