However, shortly after Warren's term began as governor, he was elected to the U.S. Senate by the newly constituted state legislature, and he resigned on November 24, 1890.

Prior to the adoption of Wyoming's primary law in 1911, the political parties nominated their candidates for office by convention.

Prior to the start of the Republican convention, incumbent Territorial Governor Francis E. Warren was seen as the likeliest, and the strongest, candidate.

[1] The Republican Party ultimately nominated Warren, though his poor health at the time raised the possibility that he might need to be replaced on the ticket.

[2] Prior to the Democratic convention, speculation swirled around three names: former Territorial Governor George W. Baxter; banker T. B. Hicks; and Evanston businessman A. C.