ABC News’ Rick Klein reports: A highly anticipated Supreme Court ruling handed down last week is expected to open the floodgates of corporate money in political campaigns — with conventional wisdom holding that Republicans are more likely to benefit than Democrats. Prominent Republican campaign attorney Ben Ginsberg is arguing that one up-shot of the ruling will be that political parties as we know them will be “threatened with extinction.” “Candidates in the political parties really will face a very tough road in terms of messaging,” Ginsberg told us today on ABC’s “Top Line.” ”This decision, and sort of where we are, I think will lead to special-interest groups being able to take over the roles that parties have played, from raising money, to candidates, from doing voter contact and get-out-the-vote activities, and doing independent expenditures and issue ads,” he added. Ginsberg said he isn’t convinced that the ruling will exclusively or even primarily benefit Republican candidates, but “Republican donors have been on the sidelines, and so this gives a signal,” he said. “What this will allow is a lot more voices to be heard. I think it’s a debate where the left has done a much better job of organizing their wealthy individuals with the unions, with the trial lawyers. It is not immediately clear that it will benefit Republicans, but the potential is certainly there.” Watch the full discussion with Ben Ginsberg HERE.