In the entire history of the state of Wisconsin, organizers have only managed to trigger recall elections four times.

Today, Dems are set to file the signatures they need for the recall election of their fourth Wisconsin GOP state senator this year: Sheila Harsdorf. Graham Zielinski, a spokesman for the Wisconsin Democratic Party, tells me Dems will submit over 23,000 signatures — nearly 150 percent of the 15,744 required.

Dems have already submitted the signatures required for recall elections against state senators Dan Kapanke, Randy Hopper, and Luther Olsen.

Here’s what this means. Presuming all four elections take place — which they all but certainly will, given the massive amounts of signatures gathered in all four cases — Dems will have matched the amount of recalls triggered in the state’s whole previous history in less than a year.

That’s as clear a demonstration as you could want of the grassroots energy unleashed by Scott Walker’s overreach, and of the organizing successes of his opponents.

Republicans have less than a week until the deadline for their signatures to trigger recall elections against Dems. They have not yet submitted any.

The election to recall Harsdorf, like at least two of the other races, is going to be a competitive one. Dems need to net three recall wins to recapture the state senate. Though they still have a very long way to go, it’s fair to say that this possibility is now in play.