"The teachers united will never be defeated!" chanted thousands of public-school teachers at a union rally. They may be right -- unfortunately. Teachers unions in this country are very influential because they can assemble a crowd. Randi Weingarten, head of New York's teachers union, put out the word, and thousands of teachers filled Madison Square Garden to demand a new contract and more money. That clout brings timid politicians into line. The unions can pay for expensive rallies at "the world's most famous arena" because every teacher in a unionized district like New York must give up some of his...
