Nobody as far as I know has claim that
only conservatives were chosen.
There is a difference however between "targeted" and "selected or chosen" Key conservative organizations like the Tea Party were certainly targeted and the list of other conservative organization is long. In order not to make this witch hunt too obvious a list of non-conservative groups would also have to be chosen for a bit of attention, and that is what would have occurred.
For Obama to sit there and claim that there was not even a smidgeon of corruption involved is ridiculous. Of course there was bias and improper actions taken as a result of decisions taken much higher up the chain of command than a few convenient grunts in an Ohio office. We now have all this re-labelled as "bone headed decisions" Well, no shit.
The term corruption is a bit over used these days, but if you choose to call it blatant political bias or any other suitable label, then by all means do so....It's all the same in the end. All parties and all President's hold political bias, so in that regard Obama and his team are no more guilty than the rest.....what is different is how the hero worshipping liberal groupies are so unwilling to acknowledge any cock-up or any wrong doing of any kind where Obama and his minions are concerned, but are quite willing to blame the previous president, or anybody except the present administration, for everything.
Naturally, there are a whole system of "buffers" in place to protect the high command....that's normal. Even the Mafia use this method to keep the Capo's out of jail. I give Obama full credit for his buffers......