Sharon Fairley was crime-busting assistant U.S. attorney in Patrick Fitzgerald’s office

Chances are, when you go to vote in the March 20 primaries — early voting begins Feb. 21 — you won’t know who all the candidates are.

That’s understandable. There are dozens of them this year. Take, for intance, the Democratic primary for Illinois attorney general, in which eight candidates are vying for the chance to succeed four-term incumbent Democrat Lisa Madigan, who is stepping down.