Updated

Sen. Susan Collins, R-Maine, will oppose a move by Democrats on Tuesday to take up campaign finance legislation, called the DISCLOSE Act, that would require greater disclosure of spending and fundraising activities by corporations, unions, and some nonprofit groups, this according to Kevin Kelly, the senator's spokesman.

Kelly, citing his boss' previous support for campaign finance legislation, said in an e-mailed statement, "Senator Collins, however, believes the DISCLOSE Act would move away from election laws in this country that treat unions and corporations alike. The bill would provide a clear and unfair advantage to unions, while either shutting other organizations out of the election process or subjecting them to onerous reporting requirements that would not apply to unions."

The legislation exempts some politically powerful, large membership groups like the NRA and the AARP, a move that Collins' spokesman blasted, on behalf of the senator.

"Senator Collins also believes that it is ironic that a bill aimed at curtailing special interests in the election process provides so many carve outs and exemptions that favor some grassroots organizations over others. This too is simply unfair," Kelly said.