It was the last scheduled GOP debate before primary ballots start being cast. But did it change anything? Last night in Tuscaloosa, Chris Christie, Nikki Haley, Ron DeSantis and Vivek Ramaswamy traded barbs, unspooled occasionally outlandish talking points and did their best to recapture the narrative in the final month of the primary race. Yet it was the candidate not in attendance — Donald Trump — who once again loomed large, defining the stage even while absent. And what we saw seems unlikely to disrupt the fundamentals of the campaign. National politics correspondent Adam Wren joins Playbook deputy editor Zack Stanton to unpack it all.