Senate Democrats failed to attract a single Republican vote on the DISCLOSE Act Tuesday, effectively defeating the bill and casting doubts over whether any campaign finance measure can pass the upper chamber before the November elections.

Aides in both the Senate and the House insist the legislation will come up for consideration again. But with Senate Minority Leader Mitch McConnell (R-Ky.) painting the bill - which failed 57-41 - as detrimental to his conference, a packed legislative docket and contentious elections on the horizon, sending the DISCLOSE Act to the president's desk now appears to be a long shot at best.

Senate Majority Leader Harry Reid, in accordance with the procedural rules of the Senate, voted against opening debate on the bill to leave open the opportunity to bring it to the floor at a later date.