And your authority for this is...? In fact, 527s have existed since the Federal Election Campaign Act was first passed in 1974, and they have never been regulated in the manner being proposed. True, they can't urge people to vote in a specific way. But short of that - of specifically saying "vote for x" or "vote against x" - they can say whatever they want about candidates. Nothing in McCain-Feingold changed regulation of 527s, except that they can't run ads that mention a candidate within 60 days of an election. If 527 rules were clear, why would the RNC be asking the FEC to write a new rule?
There are many Republican and conservative 527s: The Republican Main Street Coalition; The Republican National Lawyers Association; The Club for Growth; Citizens United; etc. etc. They will also be limited in their ability to criticize Kerry, Dashle, Kennedy et al. Be careful what you wish for.
The FEC clearly states several times that communications expressing support for or against any federal candidate are defined as electioneering and subject to Federal rules regarding the use and reporting of Federal election funds. The communications do not specifically have to state voting for or against a candidate, only that their effect is to influence a Federal election.
The ads that MoveOn and other left wing organizations are running clearly fall under Federal election fund rules and therefore subject to the donation limits and reporting requirements of a PAC.
They can say anything they want, the question is whether their activities and expenditures fall under the soft money or hard money rules.