Bear in mind that almost no media reporting is completely unbiased. CNN has never been a particular friend to the NRA or gun owners in general, so I'm inherently sceptical of any claims they make on the subject.
As to the content of the article, it's really nothing more than a guilt-by-association piece. Tara Mica is the NRA lobbyist who also worked on voter ID and immigration laws, but there is no evidence that she worked on those laws as a representative, or with any involvement at all from, the NRA.
Likewise, the article points to the NRA's opposition to the McCain-Feingold Campaign Finance Law. While this law, on the surface, was not about 2A, it did affect lobbying organizations which the NRA is. I don't think it's wrong, or even particularly unusual, for an organization to oppose a law which limits its own lobbying ability regardless of what that organizations main focus is.
Given the NRA's history of support for left-leaning politicians who still have good records on 2A such as Sen. Harry Reid (D-NV) and former Rep. Barron Hill (D-IN), I don't really buy that they're part of some vast right-wing conspiracy.