The Undead, Elf and Dwarf councillors opinions are pretty clear and you can hear their opinions before you have to decide. The Lizards are almost certainly in favour because it increases personal freedoms, and the Imps don't really care about anything that isn't science related.
Elf and Dwarf are on the bridge. Undead is in the bar. How do I talk to the Lizard and Imp about it? I ignored any battle to get to the next turn and see the different results. If I agreed it's already been passed as a law. If I refused then Oberon doesn't even bother presenting his own argument.
I guess it wasn't that important to him. Or did he only announce it as a way to hit on me?

It does seem odd that he just assumed I would side with him before hearing arguments.