[2][3] When John Frank Wilson took over his role as the territorial delegate to the Fifty-sixth Congress in 1899, Herndon accompanied him as his private secretary.
[18] In August 1918, Herndon announced his intention to run for the Arizona State Senate seat from Mohave County.
[19] In a hotly contested primary, Herndon beat out four other Democrats for the nomination, and then won November's general election.
[24] He ran for re-election in 1920, but lost in the Democrat's primary in September to James Curtin.
[38] Herndon died on July 25, 1927, in his mother's home in Prescott, Arizona, after being ill for several months.