I haven't followed the Lamont v Lieberman primary race too closely, but from what I understand, there is no denying the impact of the internet in securing Lamont's primary win over Lieberman. This is quite exciting for someone who has followed the impact of online communities on local politics -- it is all about community afterall.
CNet -- Lieberman defeat a win for 'Netroots' politics?
YouTube Nedheads group
The Nation -- Ned Lamont's Digital Constituency