"Turbulent political and economic times roiling the nation are expected to diminish initial participation by households in next year's Census despite a $326 million marketing blitz that far outspends previous Census campaigns. Mounting mistrust of government, rising identify theft and record numbers of foreclosures could discourage people from mailing back Census forms next year, according to the Census Bureau."
Among the reasons people might skip the census:
"The crackdown on illegal immigrants at the border and in the workplace may deter the estimated 12 million illegal immigrants from participating. Although most Hispanic rights groups support participation in the Census, the National Coalition of Latino Clergy and Christian Leaders is urging a boycott to pressure lawmakers to change laws and create ways for illegal immigrants to gain legal status. Unprecedented foreclosure rates and relocations after Hurricane Katrina have disrupted living patterns, forcing large numbers of people into temporary living quarters. As a result, millions of Census forms may end up reaching vacant homes."
If lower income groups and immigrants are under-counted, this hurts Democrats.