Here are a number of views on the Court's decision in Citizens United:
Jamie Raskin, in this piece in the Huffington Post, argues against the propriety of the Court's decision. Katrina vanden Heuvel has a similar take in this piece in the Washington Post.
For the opposing view, Joel Gora argues that the Citizens United decision vindicates First Amendment rights. Click here for more from the WSJ.
David Bossie and Theodore Olson make a similar argument in the Washington Post.
NPR has this report, and the Center for Responsive Politics has this report, on the impact of Citizens United.