Yes, actually, it is. Nevada very well may have been a game changer. One could argue that it's just one state, but his polling in Nevada surged quite dramatically in the past couple of weeks. Bernie's results in Iowa and New Hampshire have more people considering him to be a serious contender. California will cement that if none of the moderates drop out before then. I imagine this win will boost his already considerable margin here over other candidates, though. Being that his position in California was already 'strong' (30ish% in polls), he might even get into the 40% range, putting him out of reach even if a couple of the moderates drop out before then.