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That responsibility fell to the convention and the party machinery.
In 1948, another ProgressiveParty (known in some states as the Independent ProgressiveParty) was formed with an eye toward electing former Vice President Henry A. Wallace as President.
The ProgressiveParty disbanded in 1955, as the Cold War began to dominate the political spectrum in the United States, and any party which had not taken a stridently anti-Communist position was deemed to be unviable.