Well slickrock, I'll take your personal attacks with a good chuckle, and an indication that I did not properly explain myself.
Note that I said "pro-gun-owner", not "pro-gun". As I look at it, there are many aspects to being a gun owner, and the government makes contact with gun owners in many ways. But let's get the clearly gun-related issues out of the way. McCain supports an Assault Weapons Ban, as well as "background checks" for private transactions (closing the "gun show loophole"). The ACLU supports leaving gun control up to the states to decide. Looking at that, neither one belives the Second Amendment "shall not be infringed". I'll be interested to see how the ACLU reacts post-Heller. Regardless, McCain is generally talking out his ass by saying he believes the Second Amendment is a "fundamental right"... if it were so fundamental, he wouldn't be advocating so many "reasonable" restrictions on it. So here, McCain=0, ACLU=0.
However, there are aspects of gun ownership not directly involving guns. Take free speech. The ACLU has historically come out very much in favor of free speech, no matter if you are a good Republican, a good Democrat, or a person who thinks for himself. On the other hand, there's thing that put limitations on the free-speech rights of gun-rights advocacy groups (among others, of course), something called the McCain
-Feingold Act. McCain=0, ACLU=1.
Now let's look to searches and seizures. The ACLU supports the 4th, 5th, and 8th Amendment rights of the individual against an overzealous government. You know, "civil liberties". McCain supports the PATRIOT Act, which gives the government more authority to be overzealous. McCain=0, ACLU=2.
In a less general sense, McCain supports the "War on Drugs", the War on Immigration, and other Prohibitions that function to A) give more police power to the state and B) increase crime through pushing such activities underground. Neither of which is advantageous to gun owners. It doesn't matter if you're being illegally searched because you're open carrying, or because you "fit the profile of a drug dealer", you're still being violated. The ACLU supports drug legalization, the rights of immigrants, and other policies that would stop criminalizing such malum prohibitum
offenses, and that would eventually act to help gun owners to be left alone in the long run. A more tenuous argument, perhaps, and one that really deserves more than a paragraph to explain fully.
Final score? McCain=0, ACLU=3. As I said before, gun ownership is about more than just guns. I never said (in this thread) that Obama is better for gun owners than McCain. It can be argued that he is in fact better for gun owners, but I made that argument in another thread... can't find it at the moment, though.
Anyone else want to chime in?