unfair property tax assessment

I received the info regarding Mr. Bob Blackburn's unfair property tax assessments. Yes, it looks like his property gets the good old boy deal of being assessed at a mere $1,600 per acre while his neighbors are assessed at $9,000, $10,000, as much as $20,000 per acre for similar size lots and right next door. Residents of Timberidge off of Hwy 29 have to pay taxes on land assessed by the tax department at $40,000 per lot, while Mr. Blackburn's Timberidge lots are given the good buddy deal of being assessed at between $5,000 to $9,000. Now, this guy is going to be our next county commissioner where he can oversee more of his good buddy deals. What can the residents of Coweta do now!?
 Chamber Boardmember