The Senate is not a battleground? Apparently you have a short memory:
"If I could have gotten 51 votes in the Senate...for an outright ban, picking up every one of them, Mr. and Mrs. America, turn them all in, I would have done it."
Senator Dianne Feinstein (D@mocrat, CA)
February 5, 1995, on CBS' "60 Minutes"
No, my memory isn’t short. But you will note that even in 1995, Feinstein couldn’t get the votes - and there are more gun owners now.
If the Senate restricts the number of rounds in a magazine, the next Senate can overturn it. If the Supreme Court allows cities to effectively ban handguns with highly restrictive rules, then many citizens will be screwed - and the fight city by city will be much tougher.
Supreme Court Justices have more power than the President in matters of gun ownership and use. And Reid has voted lockstep for every liberal nominee to the Court, and fought against conservative justices. That by itself makes it outrageous for the NRA to endorse him in any way.