Not really. Despite Kerry's impressive string of victories in these early primaries, you have to remember that the delegates are not awarded on a "winner-take-all" basis. I'm not sure if Kerry has even secured 40% of the vote in too many of his "victories" (remember his 30%+ total in Iowa?) -- which means that the losing candidates can still have their delegates support someone other than Kerry. It is very possible (especially in light of this story) that the Democratic "winner" will go into the convention with less than 50% of the delegates needed to secure the nomination.
If I find a readily-available source of information, I'll check to see how many primaries had results in which Kerry's totals were exceeded by a hypothetical candidate named "Edwards + Dean" or something like that.
I guess we will just have to wait and see. It is all in the hands of the democrats.