Here's what happened during Dean's reign in Vermont.
"As an elected official in Vermont in the 1980s, Howard Dean worked tirelessly for State funding to improve teacher salaries at a time those salaries were shamefully low, and he was our champion. As Governor in the 1990s, Howard Dean made a name for himself as a fiscal conservative, limiting public spending generally, including for public schools. We opposed him when he did that.
Vermont-NEA had real disagreements with Governor Dean, especially during his early terms, and usually over finances. The most serious difference was over a legislative proposal in 1993-94 for a statewide teachers contract. Governor Dean, true to his fiscally conservative nature, supported the concept. Vermont-NEA fought it, successfully. We criticized Governor Dean for his continued underfunding of the Teachers Retirement System, and for his failure in 1995 to reappoint the pro-labor chair of the Vermont Labor Relations Board."
As far as Karen Maple - I know all about the case - that had to do with CPS not the governor.