With the candidate qualifying deadline fast approaching, a school board contest in Hillsborough County progressed this month from low simmer to rapid boil.Bonnie Lambert — a career educator with moderate views on issues such as spending and library books — is challenging District 3 incumbent Jessica Vaughn, whose positions are more progressive.Lambert, a Temple Terrace resident, and Vaughn, who lives in New Tampa, are Democrats. Their party has a slender board majority, even though the seats are officially nonpartisan.But instead of congeniality in the interest of party unity, the two have spent the last nine months taking jabs at each other on social media. Things reached a low point on May 16, when Lambert brandished an enlarged arrest photo of Vaughn from two decades ago at a political forum in Seminole Heights.Both candidates contend they are the aggrieved parties. Both say they have shown restraint when baited by the other. Both have spoken, at times, of withdrawing from the race....