Will teachers union turn on Democrats?

An old truism about feeding bears seems to apply to the strike by 26,000 Chicago teachers. You can feed a bear regularly without incident until one day you forget or don't give him as much as he wants and he eats you.

That's where Democrats find themselves after years of feeding the bears -- in this case the powerful teachers unions -- in the nation's third-largest school district and elsewhere.

The result is that Mayor Rahm Emanuel, the former White House chief of staff, is in a fight that could devour him -- and who knows how many of his party's candidates who rely on campaign volunteers from the big American Federation of Teachers and the National Education Association.

At least initially, Rahm's former boss, President Barack Obama, has opted out of the fight. Avoiding the extensive ripple effect of Emanuel's dilemma may not be possible for long, considering that both Obama and his education secretary, Arne Duncan, hail from the Windy City, and Emanuel's efforts follow Obama's initiatives for education.

Emanuel believes that extending Chicago's notoriously short school day by 90 minutes and offering to pay the educators, who already average $72,200 after 13 years experience annually, about 16 percent more over four years is a fair deal for everyone, teachers, taxpayers and especially children. Increasing the hours would up the cost.

Well, who can argue with that? Obviously the teachers, who also dislike having their success evaluated on how well their students perform on government-required exams. But when one gets right down to it, how else can one judge a teacher's performance?

Athletic coaches understand that completely. If their teams lose, their job security also fails. Emanuel and his contemporaries in many other locations also want an end to the policy of last-hired, first-out in necessary cutbacks, a standard doctrine of the entire union movement. It aims to protect not only longevity but also necessarily must appeal to the lowest common denominator.

Democratic officials for years have bought labor peace by catering to the whims of unions that think more of their members than obligations to pupils and community. As a consequence, improvement in the public school systems in most major inner cities has failed miserably.

Of course teachers should be paid a decent wage, particularly the best performers. But commonsense reforms somehow always seem to be at odds with what teachers demand, leaving hundreds if not thousands of K-12 schools mired in mediocrity.

The push for change in Chicago is modeled after what took place in Washington, D.C., under Michelle Rhee, chancellor of schools from 2007 to 2010. To improve the abysmal system, Rhee worked aggressively to week out ineffective and unqualified teachers -- controversial efforts that teachers unions fought at every turn.

Rhee's efforts helped bring on catastrophic consequences for her boss: Mayor Adrian Fenty lost his bid for re-election -- amazing, considering the unions had helped elect him during a campaign in which he promised to vastly upgrade the schools. He'd brought in Rhee to fulfill the pledge.

There was a time when teachers were disgracefully underpaid, and that brought about a rush to unionism. Along the way, pay increased and the teachers and the union leaders overwhelmingly supported one political party. Most efforts by Republicans to reward good teachers with merit pay were resisted as a threat to those who had served a long time. They opposed a host of initiatives including vouchers and other innovations.