Yes, that's attempted murder. The method doesn't matter, just the intent. A lawyer would likely argue that you can't prove intent in this case, but in your hypothetical we know the intent.
The constitution doesn't cover if states can leave the union. Until the civil war this was an unresolved question. We now know definitively that you de facto can't, at least not without permission of the federal government.
I work at a huge corp in the US, and they're constantly trying to get everyone to get their point across using simpler language. And, there are a lot of positives to doing so.
FBI is here?