He needed 15% of the convention delegates to force a primary for the Senate seat now held by Sen. Joe Lieberman (R-Ct), and despite serious arm-twisting by the city machines, Ned Lamont got a third of the votes. The party discipline was stronger in big towns, plus some of them used winner-take-all to allocate delegates, which I suspect explains why small towns provided most of Lamont’s vote — and means this total under-represents his true strength (which will only grow).
So the primary is on. Lamont could actually win it, too, although I suppose the odds are still against him.