It is nice to see.
IMO, between the anti-war hard left who hates her, and the pragmatic moderate left who is terrified she'd deep-six the Democrats in '08 because of her cold unlikeability and abysmal demographics amongst men, married women, etc..., she always had an uphill primary climb ahead of her, despite the MSM's attempts to portray Hillary's "inevitability".
However, I would not read too much into Iowa. The Iowa caucuses is more like a game of paintball where "amoeba", or "zombie infection" rules are in play, (losers join the winners teams, which grow ever larger...) rather than a straight-up democratic vote popularity contest. Personal interactions, and individuals ability to convince others in cloistered situations weighs heavily there.
The overall dynamic is more like a split jury room, than an election.