Actually, evolution has quite a bit to do with politics. Most school boards are politically elected; some are appointed (by politicians). Virtually none are chosen for their expertise in any facet of science or education.
For example, I ripped the following quote from the National School Boards Association webpage, http://www.nsba.org: We trust that reasoned people who are not education experts are qualified to set policy and govern the schools, to represent the public in public education. After all, education, in large part, reflects community values. Who better to set the policy and direction for this values-laden enterprise than local community members?
Quite frankly, this sounds like conservative code for an anti-evolution agenda regardless of what the facts may say, and it scares the heck out of me that politically-motivated school board members are more concerned with teaching 'values' than scientific theory.
Whatever your opinion on evolution may be, this should scare us all.