Advocates on the right and left say this year's school board campaigns will be ground zero in America's culture wars. The conservative North Carolina Values Coalition prepared people for that battle this week by holding training sessions for prospective school board candidates in Raleigh and Mooresville. Tami Fitzgerald, executive director of the Raleigh-based group, says the issues that have led to heated protests at board meetings are fueling intense interest in running for office. "Parents