Mills was known to have aspirations to be speaker after the retirement of John G. Carlisle. In late 1891, with the House returning to Democratic control, the Texas representative put himself in the running against Representative Charles Crisp from Georgia. Before the caucus met, Mills had 120 votes pledged to him, and if all of them had kept their word, he would have won, but only 105 did so on the final, thirtieth, ballot, against Crisp's 119. The reason, apparently, was that Mills refused to make deals.
