The Card Check slogan: "Let unions do for Mercedes-Benz, Honda and Hyundai what they already did in Detroit and the Rust Belt." Thank you, but no.
If I had employees who "organized" by card check, I'd coincidentally shut down the company, never saying it was because of the union, and fire everybody. Then I'd re-open after changing my mind in 3 months, and I'd re-hire every good worker who hadn't signed the card check.
If a union thug tried to get me to sign for card check, I'd be displeased. This is a freedom issue, and any thug who threatened me would be done with that line of work - permanently. I classify the union thugs who intimidate workers (note that this does not apply to union organizers who limit their methods to ethical means) with other terrorists, and I would respond to them identically. Let's just say I had a bad experience with union thugs - once - and that is more than enough.