Is it possible for my 4 year old son to start kindergarten a little bit early?

Our child was born on 02/10/2007, just missing the cut off to get into public school this fall. Does anyone have experience with petitioning Lafayette Public Schools (or any public school) to accept the child anyway? is it even possible and how does it work? Any tricks I should know about? I am not looking for advice on whether to send the child, because this listserv has already very kindly helped me with that decision, but I just need advice now on the petitioning process (if indeed there is one.).... we live in portage, MI just in case it varies by state... Thank you in advance