Since it's Labor Day, it's worth highlighting the results of a Gallup poll from last week: Labor unions have become markedly less popular in recent years.

Just 48% of Americans approve of labor unions. That's an 11% drop from last year, and a 17% from drop 2003.

While most Americans (66%) believe labor unions are beneficial to their own members, a slim majority (51% to 39%) think unions hurt the overall econonomy. Public opinion is split on whether unions help specific companies.

The implications of this for card-check are, well, not so great.