The lawyer behind the case that opened the door to U.S. "Super PACs" and more campaign cash now has one of his own. Thousands of U.S. dollars are seen here in this November 3, 2009 file photo at a Westminster, Colorado bank. REUTERS/Rick Wilking

The conservative lawyer who helped end political spending limits for corporations has now taken advantage of new campaign finance rules that allow “Super PACs” by launching one of his own.

Republican James Bopp, who advised Citizens United in its case to eliminate restrictions on campaign contributions by companies and unions, filed paper work last week with the U.S. Federal Election Commission to create his USA Super PAC.

The move opens the door for the Republican National Committee vice chairman to help boost Mitt Romney just as he solidifies his lead in the party’s primary fight.

Bopp had been the legal muscle for a Super PAC for Romney’s main rival Rick Santorum, called Leaders for Families, but  threw his support behind the wealthy former businessman in February. Santorum suspended his campaign on Tuesday.