A few weeks after some individual donors hit their campaign contribution limits to President Obama’s reelection campaign, they made donations to the super PAC supporting him, extending their financial support to the shadow campaign that's backing his bid for another four years in the White House.

This new trend has just begun to emerge in the most recent super PAC financial disclosures filed over the weekend with the Federal Election Commission. It's another impact of the sweeping changes in campaign finance law set off by the 2010 Supreme Court ruling in Citizens United, which opened the door ...