JOSH KRAUSHAAR: “One of the most underappreciated stories in recent years is the deterioration of the Democratic bench under President Obama’s tenure in office. The party has become much more ideologically homogenous, losing most of its moderate wing as a result of the last two disastrous midterm elections. By one new catch-all measure, a party-strength index introduced by RealClearPolitics analysts Sean Trende and David Byler, Democrats are in their worst position since 1928. That dynamic has manifested itself in the Democratic presidential contest, where the bench is so barren that a flawed Hillary Clinton is barreling to an uncontested nomination.”