Most union workers (especially in non-RtW states) are largely apathetic when it comes to their union.
no more likely to vote Democratic than anyone else.
I'm sorry, did I miss the memo that it was opposite day again?
The implication that unionized workers aren't supportive of unions in a country where it's very difficult for unions to organize is just silly. If a majority of the employees at a workplace don't actively support the union, there is no union. In fact unions in this country are still fighting for the right to organize with just a simple majority. Right now they need more then majority support in a shop and they need to sustain that support through an average of three years of stalling by management during which time management looks for excuses to fire the pro union workers. And that's three years on average, sometimes management actually plays fair and lets a vote go straight away (unionization wins over 90% of the votes where management plays let's votes go forward without delay or suppression) while other times the stalling goes for a lot more then 3 years. And the NLRB hands out wrist slaps at worst for interfering with unionization votes. So no, there is no freakin' way in hell that most union workers don't support their unions, if a majority did not actively support their union there would be no union.
The notion that unionized households don't vote democratic has a certain Steve Levitt-esqe counter-intuitive appeal but is just wrong.
Have you ever worked at GM or Chrysler? Ever known someone who has? You're not describing the attitudes of most union members here.
A lot of unions aren't terribly anti-management and are effectively another job requirement for members. Yes, some unions are extremely anti-management/political, but that hardly characterizes all of them.
Naturally, those union members who vote are more likely to vote Democratic, but compare the percentage of Democratic voting union members compared to, say the number of Democratic voting blacks or Republican voting millionaires and you'd find that union members obviously aren't as radical as you think.
By the way, the provided sources actually show a measure of disagreement with you. To quote:
While being in a union is a statistically significant predictor of Democratic voting, this characteristic competes with, and is often outweighed by, any number of other factors. That means that, on the one hand, there is significant risk for Republicans in alienating union members: a lot of them are the very epitome of swing voters. On the other hand, it means that while Democrats are likely to do fairly well with union voters, those votes are far from certain. A union man is a union man, and also a lot of other things: he may be a father and a veteran and Hispanic and a churchgoing Catholic and a resident of Denver— and all of those things will tug in different ways on the choice he will get to make as a voter.
Whoops!