Jeffrey Katzenberg is the rare exception on a list dominated by conservative donors who jumped in to finance super PACs during the Republican primaries.
Katzenberg, the head of DreamWorks Animation studios, cut a $2 million check in May to Priorities USA Action, which backs President Barack Obama. The donation is the largest so far by a Hollywood player.
Democrats have largely avoided large donations to super PACs, and Priorities USA Action has fallen far behind rival Republican groups.
Still, the president's campaign is expected to raise $1 billion this cycle, a number that would break all previous campaign funding records.
