Additional Web Resources and Opinions:

Citizens United Decision Profoundly Affects Political Landscape, Open Secrets
Experts assess impact of Citizens United, Harvard Gazette

Effect of Citizens United Felt Two Years Later, Roll Call 

Money in Politics After Citizens United: Troubling Trends & Possible Solutions, Brennan Center for Justice 

The high court's most political ruling, UPI.com

State Laws Affected by Citizens United, National Conference of State Legislatures

Unleashing the Campaign Contributions of Corporations, New York Times

How Much Has Citizens United Changed the Political Game?, New York Times

Losing faith on campaign finance, Politico

Mitt Romney's campaign-finance evolution, Politico

“Fixing” Citizens United Will Break the Constitution, American Civil Liberties Union
Politico Influence: Intelligence and Analysis on Lobbying, Politico

 

Interactives 

The 2012 Money Race: Compare the Candidates, The New York Times

Campaign Finance Explorer, The Washington Post

2012 Presidential Race, Open Secrets