They (as in their blogger Kyle) knocked it out of the park with The Religious Right's New Demand: Stop Calling Us the Religious Right :

If the phrase "Religious Right" has negative connotations, it probably stems primarily from the fact that the people who have traditionally represented the Religious Right have caused it to, you know, have negative connotations.

When people like Jerry Falwell and Pat Robertson go on television and blame the 9/11 attacks on "pagans, and the abortionists, and the feminists, and the gays and the lesbians who are actively trying to make that an alternative lifestyle, the ACLU, People For the American Way, [and] all of them who have tried to secularize America," that is the sort of thing that tends to create negative impressions about the Religious Right.

And even if they were called "socially conservative evangelicals," this type of rhetoric would still create negative impressions about the term "socially conservative evangelicals" ... and then "socially conservative evangelicals" would be telling everyone to stop calling them "socially conservative evangelicals."

You see, it is not the term that it is problem - it is the Religious Right's agenda and rhetoric.

PREACH!