Campaign Sunlight Act of 2012 - Amends the Federal Election Campaign Act of 1971 to direct the Federal Election Commission (FEC) to establish and operate a website (Campaign Accountability Site) through which members of the public may view the contents of political advertisements.
Requires the sponsor of a political advertisement to submit its contents to the FEC in a format the FEC may require. Requires the format to make the sources of such contents available on the website directly or through hyperlinks to the sources.
Requires the sponsor to submit an advertisement to the FEC within: (1) 24 hours after its dissemination, if it is disseminated during the 7 days before the election involved; or (2) 72 hours after dissemination during any other period.