While House Democrats alternatively fret and fantasize about the possibility that they could make or break this week’s vote to prevent a government shutdown, cautiously upbeat Republicans are coalescing around the notion that they might not need their colleagues’ support at all. Until recently, the conventional wisdom held that at least some Democrats might need to cross the aisle to offset the usual brinkmanship among House Freedom Caucus types. But with four days remaining until the federal government runs out of money, I’m hearing mostly optimism on the G.O.P. side following Donald Trump’s recent all-caps diktat that Republicans vote for Speaker Mike Johnson’s continuing resolution with “NO DISSENT.”