Only one member of the Fed Open Market Committee dissented. The significantly more aggressive policy is designed to provide businesses greater incentive to invest, and comes, perhaps not coincidentally, as Congress nears a deadline past which taxes will increase and spending will be cut to the tune of about $50 billion a month.
The Fed's willingness to pursue a dramatically new policy course comes after the election, before which committee members were much more divided about the direction the Fed should take.
Correction: The initial version of this post incorrectly described the additional asset purchases the Fed is undertaking. The $45 billion a month in new Treasuries purchases is in addition to the $40 billion in mortgage-backed bonds the Fed had already been buying.