I am a person. The ACLU has done many things I approve of and of course many things I don’t approve of.
The NRA is a single issue group. As I would not expect the national right to life coalition to support a candidate particularly a third party presidential candidate who was associated with Planned Parenthood nor would I expect the NRA to support a candidate particularly a third party candidate who was associated with the ACLU.
But then maybe I am wrong in my impression the ACLU does not consider the right to bear arms a civil liberty?
No, they don't. After the Heller decision, for example, they put a very plain, pointed statement on the front page of their website saying they still held the collective rights interpretation and believed Heller was wrong.