Around the time school started this fall, teachers across Minnesota found their mailboxes filling up with postcards printed on glossy paper.
One featured a smiling teacher, clutching a stack of papers in front of a classroom, and a question: "Is what's best for the union really what's best for you and your classroom?"
"Minnesota teachers now have a choice," read another. "Get the facts. Do what's best for YOU."
The state's public school teachers find themselves at the center of a divisive battle over the future of their labor union, Education Minnesota. In late June, the U.S. Supreme Court ruled that public employees who do not join unions cannot be required to pay for collective bargaining.
Since then, the leaders of Education Minnesota — one of the state's most powerful political forces, with 90,000 members and formidable campaign spending power — have been pushing hard to keep the numbers up.
Meanwhile, outside groups hoping to diminish the union's size and influence have seized on the moment, launching a well-funded campaign to get teachers to reconsider their membership.
The debate hit a fever pitch last week, during Education Minnesota's annual seven-day "drop" period — the only time of year in which members can opt out of the union. That window closes Sunday.
Both sides are seeking greater influence on some of the biggest and most controversial issues in education, including teacher tenure rules and curriculum policy.