AUGUSTA — Lawmakers on the Education Committee split along party lines Friday in rejecting the governor’s nomination of conservative blogger Susan Dench of Falmouth to the University of Maine System board of trustees. “I think they value partisanship over diversity of opinion,” Dench said after the 8-6 vote. Democrats on the committee questioned her writings and positions on social and educational issues, and heard testimony from one speaker who accused Dench of plagiarism, an allegation Dench denied. ... One speaker at Friday’s hearing, the chairwoman of the English department at the University of Southern Maine, said Dench had plagiarized long...