Professor Richard Epstein in the N.Y. Post today (h/t EFCA Updates)

Union membership has dropped relentlessly from about 35 percent of the work force in 1954 to about 8 percent today. The main factor is the massive attrition in failed unionized industries such as steel, automobiles and rubber. A chorus of labor advocates falsely attributes this collapse to management's alleged unfair labor practices of management in union elections, about half of which labor wins anyway.

The true explanation lies in a simple fact: Unions are a bad deal for most workers. They get some added bargaining leverage, but pay heavy dues, give up prospects for advancement in the firm and face higher odds of layoffs by hamstrung employers who can't compete in ever-more competitive global markets.

The false diagnosis leads to the bill's two-part "cure" to the nonexistent problem:

* It eliminates the need for a union to win an actual election to become the workers' representative. Instead, gaining a simple majority of the targeted work force - in the form of signatures on cards - would make the union the official bargaining agent for all workers, including those who had no knowledge of the union's activities.

* Worse still, the act lets a government-created arbitration panel impose the first two-year contract over the employer's objections if the two sides don't reach agreement within 130 days after union certification.
...
With the economy wobbly, we don't need a massive government intervention to disrupt the balance between management and labor.

So it may be a disaster for the economy and strips rights from workers, but Chris Bowers reminds us what the Card Check bill is all about anyway (my bold):

In short, this means we are pretty much set for the six seat pickup that will allow Obama to pass pretty much any legislation, and we need two of the remaining five in order to score the Employee Free Choice Act...It is important for Democrats to rack up as many wins as possible…The more seats we win now, the longer our majority will last. Even beyond Obama, such a huge victory could secure the Senate for a long, long time.

Bowers’ has explained in the past that the point of Card Check is to create a "Positive Feedback Loop For Progressives."  Yep, that’s why you seek office and pass legislation, so you can win more elections. This isn’t about workers, or justice, or the economy: It is about the acquisition and retention of power. Watch out workers, here comes Bill.