MADISON, Wis. — Hans von Spakovsky is one of the nation’s premier experts on political campaigns, elections and civil rights.

So when the former Federal Election Commission member describes something as “un-American,” he does so with a keen perspective and the kind of credentials that relatively few possess.

But that is precisely how von Spakovsky views Wisconsin’s John Doe law and, in particular, its recent use as a political tool to hound conservative organizations and Republican Gov. Scott Walker.