It's not a conservative or a liberal issue

It's a basic fairness issue.

Taxpayers should not have to pay for the professional advocacy of policies they object to.

That's what the West Virginia teacher's union said in 2003 when they filed suit to stop this practice:

The American Federation of Teachers - West Virginia has filed suit against the West Virginia School Boards Association (WVSBA) seeking to block the organization’s advocacy efforts. The teachers union argues that state laws allow WVSBA only to provide training to school board members and characterizes other activities as “taxpayer-funded lobbying.” “The School Boards Association has gotten very aggressive in its lobbying,” said a spokesman. “We think it’s wrong.”