This number is the highest yet that Sanders has seen nationally in the entire 2016 Democratic election cycle, and is outperforming President Barack Obama 2008 numbers by 9%.
Take a look at the graph below showing how things were shaking out at this exact moment in time in 2008. Barack Obama was still seen as the heavy underdog to Hillary Clinton, with many (If not most) in the mainstream media thinking that it would be impossible for him to ever overcome Clinton in the 2008 election.
Not only is Bernie Sanders surging nationally, he's also surging in the very important state of New Hampshire. According to the latest polling results there, Bernie Sanders has a massive 13% lead over her there, and seems to be carrying all of the momentum heading into February.
When looking at the results of the most recent Fox Poll, Hillary Clinton does still have the advantage of Sanders by 15%, but her lead has continued to diminish over the past 9 months of this race.
Will Bernie Sanders overcome Hillary Clinton? Nobody can say for certain at this time, but many think that IF Bernie Sanders can pull off winning the first two states in the 2016 nomination (Iowa and NH) that he may be able to create a Domino-effect and overcome her with the momentum that could be built from that.