The Democratic Party is more unified these days than it was in the past—and is certainly less openly divided than the Republicans, who just took five days to select a Speaker of the House. The main reason for this newfound internal harmony is the evolving behavior of the American electorate: the moderate/conservative dissident bloc of Democrats representing rural constituencies has mostly disappeared from office, replaced by more ideologically orthodox Democrats from the suburbs. This change has made party leaders' job easier and has eased the chronic factionalism that is now more evident on the Republican side of the aisle, as I explain further in my latest column for Bloomberg Opinion.