Does Google Censor the US Results Too?

From google.az:

From google.co.uk

The Boing Boing post on Google censorship today; got me to
wondering if Google censors US results.
I've posted the screen shots below for a search of "Karl Rove"
7,100,000 in the US, 13,800,00 in Azerbaijan and 12,900,000 in the UK.

From google.com:

From google.az:

From google.uk: