Political Manipulation of the Census has been Rejected throughout the course of American history
"A report released by House Committee on Oversight and Government Reform Republican staff examining the Constitutional foundation and history of the U.S. Census concludes that while the latest attempt by the White House to politicize the Census, though not entirely unprecedented, is unlikely to succeed...

The report’s release comes in advance of the scheduled Friday confirmation hearing of Census Director nominee Robert Groves who must explain how his leadership will result in an apolitical count that fully meets all Constitutional requirements. Questions about Groves’ ability to lead the Census Bureau have recently been raised by his decision to single out Congressional Republicans – while excluding Congressional Democrats – for criticism in a May 7, 2009 Associated Press story..."