I'm not too fussed about Gill withholding it's funds from ACLU, they funded to the tune of $15,000 in 2001, given that the current ACLU budget runs $130 million I don't think the loss of something like .01% is a worry.
Also given they're joining with log cabin on this it's fair to say we're not talking about the core of the lgbt movement. This was status quo in 'LGB' community 20 years ago, today we're mostly recognized as equals.