"What's most in need of disclosure is the real purpose behind this bill -- it's nothing more than a brazen attempt to tilt the playing field in favor of the incumbent party in this fall's elections, silence constitutionally protected speech and abridge First Amendment rights," said Tom Donohue, chamber president and CEO, said in a statement.
Zeese's group will launch a Protect Our Election campaign in the coming days to combat the Chamber.
"We will no longer allow corporations or partisans to run our elections with secret money," Zeese said.
The Disclose Act requires major donors to political ads to publicly disclose themselves. It also bars foreign corporations with domestic subsidiaries, federal contractors and TARP recipients from spending their money on elections.