Katherine Stone on the U.S. Employee Free Choice Act

Kathy Stone is one of the leading labor law scholars in the U.S.  (She is visiting York this week, actually, at the Hannah Arendt conference this Thursday and Friday at Schulich).   In this post, Professor Stone weighs in on the intense and heated debate ongoing in the U.S. about labour law reform in the form of the proposed Employee Free Choice Act.   That is the legislation that would allow unions to be certified by collecting membership cards on behalf of a majority of workers rather than by winning a vote.  Stone is supportive of the legislation.  Others, mostly those that think unions and collective bargaining are evil, strongly oppose the legislation, including Richard Epstein of the law and economics school of thought.
If the U.S. moves to card-check, should we go back to the model in those jurisdictions that have moved away from it in recent years (including Ontario)?