NEW : Republicans accuse Democrats of an `` assault on the First Amendment '' a charge that is not only false but also misguided. The bill would require groups paying for ads to disclose their top donors in the ads . Democrats claim the bill is necessary to reduce the impact of a Supreme Court ruling .
NEW : Republicans accuse Democrats of an `` assault on the First Amendment '' The Senate GOP stops Democrats from ending debate on a campaign finance bill . The bill would require groups paying for ads to disclose their top donors in the ads . Democrats claim the bill is necessary to reduce the impact of a Supreme Court ruling .