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According to an obituary by ''[[The New York Times]]'', Frelinghuysen was a member of the [[Whig Party]] until joining the [[Republican Party]] upon its inception.<ref name=obituary/> He was also crucial in establishing the state GOP in New Jersey.<ref>July 20, 1998. [https://www.britannica.com/biography/Frederick-Theodore-Frelinghuysen Frederick Theodore Frelinghuysen]. ''Britannica''. Retrieved November 8, 2021.</ref>

According to an obituary by ''[[The New York Times]]'', Frelinghuysen was a member of the [[Whig Party]] until joining the [[Republican Party]] upon its inception.<ref name=obituary/> He was also crucial in establishing the state GOP in New Jersey.<ref>July 20, 1998. [https://www.britannica.com/biography/Frederick-Theodore-Frelinghuysen Frederick Theodore Frelinghuysen]. ''Britannica''. Retrieved November 8, 2021.</ref>

In 1861, he was a delegate to the Peace Congress. Appointed Attorney General of New Jersey by Governor Charles S. Olden, he served in the post until 1867.

In 1861, Frelinghuysen was a delegate to the Peace Congress. Appointed Attorney General of New Jersey by Governor Charles S. Olden, he served in the post until 1867.

===U.S. Senate, 1866–69===

===U.S. Senate, 1866–69===