Significant milestones over the next few weeks could shuffle the status quo. For now, both sides remain dug in as the closure heads into a fifth week.Senate Republicans were confident that the call on Monday from the largest federal employees union for an end to the government shutdown would finally nudge labor-allied Senate Democrats to move toward resolving the stalemate entering its fifth week.Democrats were instead mostly unmoved.Their bet was that news on Wednesday of soaring health care premiums because of expiring Obamacare tax credits might finally persuade Republicans to negotiate on extending the subsidies. That didn’t pan out either;...