One of the interesting statistics from the Iowa caucuses is how union members voted. They gave most of their votes to Obama, with Clinton coming in second and Edwards, third. Obama, who has less organized labor support than any of the top three candidates, captured the imagination of union households just as he captured the imagination of other Iowans.

Whether he can continue this trend could be key to his winning the nomination. It's something to watch as the primaries continue, but it's also something for the unions to consider.

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