Mason Malmuth from 2+2 had his lawyers do a check on PPA to see if you should tell the 2+2 forum members to support them, he elected not to after the report:
http://forumserver.twoplustwo.com/showflat.php?Cat=0&Number=8351829&an=0&page=0#Post8351829
Unlike most not for profit organizations that represent a large national interest group, the PPA is unusually difficult to obtain information from.
As a not for profit organization, the PPA is prohibited from allowing any part of the net earnings of the entity to inure to the benefit of any private shareholder or individual (26 U.S.C. S 501(c)(4)(a). However, PPA members cannot verify the organization’s compliance because it has never published an annual report, or made its budget information available to its donors or members. In fact, we have not seen a disclosure or list of any individuals who were compensated for their services to the PPA.
Our investigation of the PPA’s Washington, D.C. office found a shared rented office space with a receptionist who stated that she rarely saw any PPA representatives physically at the Washington, D.C. location.
The only way for legitimacy to be evident is for basic financial information about the organization to be transparent. It is not. Thus, in summary, we cannot encourage Two Plus Two to actively promote or endorse the PPA.