Only 22% of Americans say they can trust the government in Washington almost always or most of the time, among the lowest measures in half a century,  according to a new Pew Research Center survey. Could this pose problems for the Census Bureau as it tries to persuade Americans to participate in the 2010 Census?

The latest national mail participation rate, released April 16, is 69%. In 2000, 72% of households mailed back the census forms they received.