I was a member of the Retail Clerks Union when I was working my way through college. Doing one of those jobs that lazy Americans aren't supposed to want to do.
My fellow employees weren't involved in the union activities or politics. There were never more than 3 of us, out of 10,000, at the union meetings versus 30 union reps.
So maybe that number could be right, if they're polling members of all the different kinds of unions and not just UAW.
I've got a feeling the number would be higher since 9/11.
Many members of the longshoremen's union (ILWU) have changed their political preference, which used to be strongly Democrat, to a more conservative outlook. They realize that the shipping companies would love to hire illegal aliens for pennies if they could get away with it. They are disgusted with Bush because of his open border policies, and many are planning to vote third party.