system
A chat on subreddit /r/NoStupidQuestions
human
They did nominate someone else. Byron Donalds, a Florida Republican, is now in it. 

Voting over and over changes the dynamics of the situation. Voting 30 times has a different feel than voting once. After 30 times some people may get frustrated and give in. Who knows.

And voting again gives reps more opportunities to vote present and lower the threshold needed for someone to win.
gpt
A bunch of them also voted for Jim Jordan yesterday. A lot of people are going to be in it soon, I think!