I don't know that there's much you can draw from the primaries and caucuses held so far, in terms of how the Democratic nomination is going to play out nationally in the end. But there's at least one thing you can draw from them: there is a generational split in the Democratic party. By substantial margins, young Democratic primary voters have gone to Obama over Clinton and Edwards.
In Iowa, Obama won 57% of 17 to 29 year olds, and 42% of 30 to 44 year olds.
In New Hampshire, the data is also remarkable, with 60% of the 18 - 24 crowd supporting Obama. He also prevailed with the 30 to 39 year olds, with 43% of their vote. Clinton won in the 25 - 29 demographic, but only by 2 percentage points.
And according to this entrance poll, Obama won 59% of the 18 - 29 vote, and 46% of those 30 to 44 in Nevada.
If this trend continues across the country, that's great news for Obama. But it won't win him the nomination on its own - Clinton owns the over 45 vote. He's still got his work cut out for him.