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Knowland supported the candidacy of [[conservative]] [[Barry Goldwater]] for president in the [[United States presidential election, 1964|1964 election]].<ref name="William E Knowland Is Apparent Suicide; Ex‐Senator Was 65"/>

Knowland supported the candidacy of [[conservative]] [[Barry Goldwater]] for president in the [[United States presidential election, 1964|1964 election]].<ref name="William E Knowland Is Apparent Suicide; Ex‐Senator Was 65"/>

==U.S. Senate==

===U.S. Senate===

After the death of incumbent senator Hiram Johnson, then-governor of [[California]] [[Earl Warren]] appointed Knowland as an interim to the seat.<ref name="William Knowland: A Featured Biography">[https://www.senate.gov/senators/FeaturedBios/Featured_Bio_KnowlandWilliam.htm William Knowland: A Featured Biography]. ''United States Senate''. Retrieved April 22, 2021.</ref>

After the death of incumbent senator Hiram Johnson, then-governor of [[California]] [[Earl Warren]] appointed Knowland as an interim to the seat.<ref name="William Knowland: A Featured Biography">[https://www.senate.gov/senators/FeaturedBios/Featured_Bio_KnowlandWilliam.htm William Knowland: A Featured Biography]. ''United States Senate''. Retrieved April 22, 2021.</ref>