Key takeaways: Should the 2020 Democrats go big or get real?

DETROIT (AP) — Should Democrats be going big or getting real? That's the question that dominated the Democratic presidential primary debate as progressive favorites Elizabeth Warren and Bernie Sanders fended off attacks from lesser-known moderates. The display amounted to a sometimes testy public airing of the party's anxieties about how far left is too left and how to beat President Donald Trump. Here are the key takeaways from the debate:EVOLUTION VS. REVOLUTIONThe battle lines were clea