Harvard law professor and political activist Lawrence Lessig has made it his mission to fight the corrupting influence of money in government. He's the founder of Rootstrikers, a nonprofit devoted to reforming a political system in which ordinary people no longer have influence. He's also the author of the recent Republic, Lost: How Money Corrupts Congress—and a Plan to Stop It, which looks at how wealthy special interests and changes in campaign finance laws have brought America to the position it is in today.
Since then, there's been a good amount of pushback from progressives, worried that the decision could give small groups disproportionate political influence. Stephen Colbert has set up a mock superPAC to expose the corruption of campaign finance. Montana's Supreme Court just upheld a ban on corporate political expenditures in the state's elections. Activists across the country have planned events today and tomorrow, pushing for a constitutional amendment overturning the decision.