The WT controls EVERY part of it's members lives. Now if they really allowed voting, then obviously since they have the only channel to God, they would be expected to provide guidance as to who is the best candidate and best party, etc.
Well, if you look in the IRS booklet for tax exempt organizations, including religions and churches over here, go to page 5, "jeopordizing tax exempt status". http://www.irs.gov/pub/irs-pdf/p1828.pdf
One of the things that will make them lose the tax exempt status,,,"they must not participate in, or intervene in, any political campaign on behalf of or in opposition to any candidate for public office"
Another thing, it seems they MUST provide some sort of charity. And if they don't, then religious services and the PROMOTION of religion.
Unless I'm reading it wrong, that means if they didn't keep pushing for more door to door, then they would be forced to give back money for real charity!!
Reading the IRS guide, I think they really could lose their tax exempt status if it was exposed they are really working that system and not giving any sort of charity and it's all a smoke shield to make money for those high up who contract all the services being done.