Tea Party activist Mark Meckler has joined the leadership of the Campaign for Primary Accountability (CPA), a disruptive super PAC aimed at ousting long-term incumbents from Congress. He has become part of a four-person, conservative leadership team of a group that says its aims are nonpartisan.

Meckler officially joined the $2.5 million super PAC, one of the outside groups spending the most in congressional primaries, as a senior advisor earlier this week but said he has been friends with its founders for quite some time and got to know them through the Tea Party movement. He resigned from the ...