John welcomes back Searchlight Institute president Adam Jentleson to discuss the post-Labor Day Senate battleground map and his new book, “Supermajority: How Democrats Can Build Lasting Power.” Jentleson explains why cautious optimism is in order about his party’s prospects of retaking the upper chamber; how the strength of James Talarico and Rob Sand (in the Texas Senate and Iowa governor’s races, respectively) are rooted in the sort of ideological heterodoxy Jentleson champions in his book; why the razor-thin margins and slim majorities of our time are historical anomalies; and the degree of compromise Democrats will need to accommodate to build governing coalitions broad enough to last.