Washington PostPlay Democratic debate bingoWashington PostFive Democrats are on stage in Las Vegas tonight for the first Democratic debate of the 2016 race. My colleague Dave Weigel put together a great explainer of some of the key progressive issues many liberal voters are watching for candidates to address.Most US voters not aware of Democratic debate: Reuters/Ipsos pollReutersDemocratic Debate Host Steve Wynn More of a RepublicanNew York TimesQ+A: Ed Henry of Fox News Channel talks Hillary, Las Vegas, Fox vs.