August 4 is the first day for Illinois residents who want to run for federal and state office in the 2010 primary to begin petitioning.
Illinois requires all candidates running in a partisan primary, for federal and state office, to submit petitions. Because the 2010 primary for all federal and state office is in February, petitions to get on a primary ballot ballot circulate from early August to early November of the year before the election. Illinois is the only state that has ever held its midterm year primary for Congress and state office as early as February. See this news story.
Many Illinois newspapers have editorialized that the state’s midterm primary date is ridiculously early, but the state’s legislators did not seriously consider moving it. Incumbents tend to feel that it is easier for them to get re-elected when the primary is very early.