Sure, but who are they lying for and for what ends? Lying to hide an sexual affair is not the same as G. W. or Tony Blair lying to forcibly occupy a couple of nations. Tammany hall nepotism is different than congress meeting with insurance and health care industry buddies and figuring out how to scuttle any talk of universal heath care or card-check.
Zinn didn't talk about realpolitik because he is not interested in the needs and concerns of the ruling class - he was interested in explaining how their needs effected native people, farmers, freemen, immigrants, dissidents, and the working class.