I'm not a big believer in either the accuracy or the impartiality of Wikipedia it's a much better source of information on this subject then a right wing conspiracy fever driven bunch than Judaical Watch:
IRS targeting controversy - Wikipedia
And now were in the arena of dueling sources.
But really this is a a straw man anyway.
The fact is that right wing hate groups increased over 1000% and that the Republican Congress passed a law specifically forbidding the justice department from publishing this information and order the destruction of the data on the subject.
Did the IRS overstep it's authority in this thing ?
Yes it did.
Did it do it for political reasons ?
Even the Republican controlled investigation into the scandal says no, it did not.
The IRS appears to have been attempting to do something to interdict and track right wing wacko groups since the Republican controlled Congress had tied the Justice Departments hands on the subject.
It seem to me to be the height of intentional ignorance to forbid one part of the administration from doing it's job and then faulting another part for attempting to pick up the slack.