Well, yes, but so were liberal groups. Progressive, green energy and occupy were also on target lists.
The issue was that the IRS was not supposed to target specifically based on ideology but they were supposed to target political organizations which should not qualify for tax exempt status. That was the issue.
Not vindictive or inherently biased, the tea party movement was just bigger so there were a ton of requests from tea party groups popping up which were flagged. The IRS now has a policy in place to monitor the filters used and nothing can be added without approval.