In just six years, Connecticut Sen. Joe Lieberman has gone from winning his party’s vice presidential nomination to facing a serious primary challenge. And although he may yet capture the Democratic slot on the ballot, the extent of Lieberman’s political trouble is apparent: Last week, he announced that he will seek the signatures necessary to run as an independent in November should he lose the August primary.

Those responsible for Lieberman’s dilemma are the Web-organized activists who congregate on such blogs as Markos Moulitsas’ Daily Kos and call themselves the “netroots.”

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