"All they can" being a euphemism for "blackmail."
The heads of several unions -- police, fire, and teachers -- have sent a letter to a Wisconsin business asking for them to publicly support their fight against Governor Walker -- and informing them should they choose to not support them, they will engineer a boycott of them.
Marshall & Ilsley Corporation was one of Walker's bigger donors, it appears -- which means that they spent a fraction of the money the unions spent trying to defeat him. And that is a declaration of war. They want the bank to not only stop supporting him, but to back them. Or else.
(It's worth noting that the first signatory, James Palmer of the Wisconsin Professional Police Association, was busted for DUI in 2009 -- hat tip to Jeff Goldstein.)
This is so far beyond intolerable, I don't know how to react. This is the public sector unions declaring war not on their political opponents (they did that already), but now those who have supported their opponents in the past.
OK, it's war. I don't like it, but that doesn't matter any more.
One countermove comes to mind: start waging war back against the unions. They've shown their true colors, they've demonstrated that they feel no compunctions on their behavior.
So decertify them.
The Republicans are under attack on every front. They literally have nothing to lose -- the Democrats and their union owners have made it abundantly clear that they intend to destroy the Republicans by any means necessary -- strip them of their supporters, recall them, assault them in public, perhaps even kill them. If the Republicans were to move to decertify the unions, what more could the leftists do? What further threats can they throw out? What further attacks can they make?
This does have the advantage of being exceptionally provocative, and if there's one thing that the left has shown in Wisconsin, they are quite willing to be provoked to lash out in anger. And while that fires up their base, it marginalizes them with the general public.
Von Clausewitz observed that "war is not merely a political act, but also a political instrument, a continuation of political relations, a carrying out of the same by other means." Here's a case of political war being declared and waged.
And the only thing worse than war is slaughter, when one side refuses to fight back.