May 1, 1952:

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Sen. Brien McMahon of Connecticut announces his candidacy for the Democratic presidential nomination.

A self-described "liberal Democrat" and a staunch supporter of President Truman's foreign policy, McMahon was the author of the 1946 Atomic Energy Control Act.

McMahon was first elected to the Senate in 1944 and won a second term in 1950. He died in office in 1952. In the special election held that year to succeed him, Prescott Bush (R) — father and grandfather of future presidents — defeated Rep. Abraham Ribicoff (D).

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Tags: A Look Back in Politics