Polls are all over the place but Real Clear Politics national polling average has Clinton lead over Sanders at lowest point ever!
I don't know how important national polls are at this time as the first contests in Iowa and New Hampshire tend to influence the narrative greatly.
RCP average does not include latest NBC Poll, taken Wednesday through Friday which states that 42% of Democrats and independents who lean Democrat nationwide support Clinton, compared to 29% who support Sanders. Just five months ago, Clinton led Sanders by 45 points in the April NBC News-SurveyMonkey poll