Quote from White House Secretary in “Bush Joins McCain in 527 Ad Challenge:”

“The president said he wanted to work together [with McCain] to pursue court action to shut down all the ads and activity by these shadowy 527 groups,” McClellan said after Bush spoke to McCain by telephone this morning.

Text of First Amendment.

Buckley v. Valeo, 424 U.S. 1 (1976)

McConnell v. Federal Election Commission, 540 U.S. __ (2003)

Summary of McConnell.

Federal Election Commission website.

Bates,  “Political Advertising Regulation – Unconstitutional Menace?

Burchfeld “Enemies of the First Amendment

Pilon, “The Case For Campaign Finance Reform.”

A Newsroom Guide To Political Advertising.

University of Iowa sources on political advertising.

Resources on 527s.