As Eric Alterman says

Unable to escape the intellectual straitjacket that requires them to cover the Republican Party as if its ideas are serious, they accept a false equivalence between Republican crazy-talk and normative reality. Clearly, no honest analysis can support such coverage of a party whose leading candidates—including Donald Trump, Ben Carson, Carly Fiorina, and Ted Cruz—routinely say such nutty things that they make far-right extremists like Jeb Bush and Marco Rubio sound relatively reasonable.