Jeffrey Toobin examines whether or not the IRS did anything wrong:

So the scandal—the real scandal—is that 501(c)(4) groups have been engaged in political activity in such a sustained and open way. As Fred Wertheimer, the President of Democracy 21, a government-ethics watchdog group, put it, “it is clear that a number of groups have improperly claimed tax-exempt status as section 501(c)(4) ‘social welfare’ organizations in order to hide the donors who financed their campaign activities in the 2010 and 2012 federal elections.”