Citizens United v. Federal Election Commission, political science homework help

There have been many laws put in place designed to regulate campaign financing. The 2010 Supreme Court case Citizens United v. Federal Election Commission is expected to have major influences on the conduct of future election.

A. Explain what this case is about. Include background information and the final ruling on this case. You would need to do outside research for this case.
B. What are the implications of the Supreme Court ruling in this case for future elections.