by Mike Krumboltz This is not an April Fools' Day joke. Census forms are due today for almost all citizens of the United States. The due date, well publicized on commercials and print advertisements, has led many to wonder of the consequences of not filling out their form. Web searches on "what happens if I don't fill out my census" are on the rise, as are related lookups on "is it against the law not to fill out census." Wondering yourself? Here are answers,