WITH GRASSROOTS, TEA-PARTY POLITICS: How Republicans engineered a blow to Michigan’s powerful union.

From outside Michigan Republican circles, it appeared that the Republican drive to weaken unions came out of the blue – proposed, passed and signed in a mere six days.

But the transformation had been in the making since March 2011 when Colbeck and a fellow freshman, state Representative Mike Shirkey, first seriously considered legislation to ban mandatory collection of union dues as a condition of employment in Michigan. Such was their zeal, they even went to union halls to make their pitch and were treated “respectfully,” Colbeck said.

The upstarts were flirting with the once unthinkable, limiting union rights in a state that is the home of the heavily unionized U.S. auto industry and the birthplace of the nation’s richest union, the United Auto Workers. For many Americans, Michigan is the state that defines organized labor.

But in a convergence of methodical planning and patient alliance building – the “systematic approach” – the reformers were on a roll, one that establishment Michigan Republicans came to embrace and promised to bankroll.

Read the whole thing, but here’s the key: “They built from the grassroots, bottom up.”