As a U.S. Representative, Zioncheck was known mostly for ardently championing Franklin Roosevelt's New Deal policies. But his tireless work on behalf of the New Deal often was overshadowed by his many personal escapades, which included dancing in fountains and driving on the White House lawn. Beset by the press and by critics of Roosevelt's policies, Zioncheck became depressed and hinted that he might not seek reelection to a third term in 1936. In his diary entry for April 30, 1936, Secretary of the InteriorHarold Ickes recounted how Zioncheck had asked him to officiate at a wedding with his fiancée, Rubye Louise Nix. Ickes demurred, saying that he had no authority to do so; he was aware of Zioncheck's reputation and simply did not want to get involved. Ultimately, Zioncheck went to Annapolis, Maryland for the wedding and San Juan, Puerto Rico for his honeymoon. On August 1, Zioncheck's friend and ally, King County Prosecutor Warren G. Magnuson, took him at his word regarding his retirement plans and filed to run for Zioncheck's House seat.
Marital and mental problems
On May 30, 1936, his wife left him after an argument during a party at their apartment. On June 1, he became frantic and searched Washington, D.C. for her. He was arrested later that day on a lunacy warrant. He was confined in Gallinger Municipal Hospital Psychopathic Ward, during which his wife returned to him. Doctors blamed overwork and his hectic lifestyle. He was later transferred to a private facility in Towson, Maryland, but escaped and fled to Washington, where he received congressional immunity.
Death
Zioncheck died after plummeting to the sidewalk from a window of his office on the fifth floor of the Arctic Building, at 3rd Avenue and Cherry Street in downtown Seattle, on August 7, 1936. He struck the pavement directly in front of a car occupied by his wife. A note was found; it read, "My only hope in life was to improve the condition of an unfair economic system that held no promise to those that all the wealth of even a decent chance to survive let alone live." Zioncheck was mourned at his early death; both the University of Washington and Boeing closed down for half a day in his honor. He is buried in Evergreen-Washelli Cemetery in Seattle.
''Zioncheck for President''
Zioncheck is the subject of an unpublished book-length poem by Grant Cogswell, entitled Ode to Congressman Marion Zioncheck. The story of Zioncheck, and Cogswell's obsession with him, is detailed in Phil Campbell's 2005 book Zioncheck for President: A True Story of Idealism and Madness in American Politics. The option to make Campbell's book into a feature film was purchased in 2007 by producer/director Stephen Gyllenhaal.