We haven't heard of one left-leaning group that has come out saying that they were targeted. You have tea party groups, people who advocated for lower taxes, who "educated" people on the constitution, NOM, and even hawkish Jewish groups that were all targeted. In other words, all right-leaning groups.
If there was a arguably disproportionate number of conservative groups relative to liberal groups, MAYBE I could possibly see that as the case, however, considering that the disproportionality is100% to 0%. Not to mention that now we have heard that it not only came from the divisions hub in Ohio, but now from California and DC as well.
I simply don't buy it.