Yes, it's a problem when the person delivering the policy paper is also a paid lobbyist.
The Great Think-Tank Bubble
February 19, 2013
Why are so many think-tank scholars being paid like lobbyists? Because they're acting like lobbyists, too.
Chuck Hagel's Think Tank, Its Donors, and Intellectual Independence
February 12, 2013
In response to demands from Senate Republicans, the think tank led by Chuck Hagel has released a list of its foreign donors, along with assertions about its intellectual independence from all of its funders. But like most other Beltway think tanks, the ties between scholarship and money are a lot closer than meets the eye.