They all say so.
In all fairness, they don’t come across as sell-outs for a lobbying firm (at least not all of them). I think the proper appellation is “beard”. The corporate line filigreed with a smattering of bloggers who are flattered to be considered as real honest-to-God writers makes for an awful persuasive cover.
The sad part is how few of them would even consider the fact that they’re being used.
“It is hard to believe that a man is telling the truth when you know that you would lie if you were in his place.” — H.L. Mencken