Tt's a chicken/egg scenario.
IF The parliamentarian cites rule 312, then it's 50 votes to overrule her.
But if Harris decides to overrule the parliamentarian - then... McConnell calls a POO using Rule 312... requiring 60 votes to overrule.
It's upsetting to see these NeoProgressives demanding that Harris act as their mule. Because they're to chicken shit and dont want the eventual blame for failing the 60 vote.