Because right-wing blogger Erick Erickson actually posted the item on March 31. In it he demanded:

At what point do the people tell the politicians to go to hell? At what point do they get off the couch, march down to their state legislator's house, pull him outside, and beat him to a bloody pulp for being an idiot?

Why could that double as a punchline? Because, as blogger Matthew Yglesias notes, Erickson's call for mob violence was prompted by “an environmental regulation relating to dishwasher detergent.”