The best policies money can buy...
So here's the new, improved political cycle:
 MegaCorp runs megabuck campaigns to brainwash the public.
 Public opinion polls reflect these new, 'improved', 'whiter than white' opinions.
 The government becomes unpopular and either abandons its policy or it gets voted out of office.
 Either way, MegaCorp gets the policies it wants.
Who said democracy doesn't work?