Citizens United didn't change campaign politics that much, but it did expose how unsavory the nexus of politics and money have become.
It's the two-year anniversary of Citizens United v. Federal Election Commission, the Supreme Court case that gave corporate the same free speech rights as people—including unlimited independent political spending.
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.