Mark,
I agree with SIDESHOW, write AND call, it can't hurt.
It's always about money! If there wasn't any financial gain for the companies, they wouldn't be pursuing it.
Let's face it, when it comes time to vote on this issue, whether to get it out of committee, or for passage, LM and the rest are going to have their lobbyists call influential congress persons and remind them about who made campain contributions and the probability of continued support in the future should they vote for this bill. Congress people always respond to people who put financial pressure on them.
Like I said, it's all about money.
BRG,
Jon