Politico: Amazon will begin offering free to dirt-cheap subscriptions to the Washington Post to its tens of millions of Prime members. While Amazon has never released the number of its Prime memberships, the latest estimates range from 25 to 40 million. That’s a powerful installed base of customers to expose to the Post offer. The initiative, long in the works, bolsters the Post as a revivified national and global news source, one more competitive to the New York Times, among others.