Clinton's freiwal is officially the 278 freiwal (possibly 279, not sure about ME-02.) The only Obama states Trump has a chance in are IA, OH, and FL, and it's not like he has those states in the bag, either.
I'd add Nevada to that list. Still not enough to push him over the top, though.
Trump won't win Nevada, trust me. Polls always show a close race in Nevada, only for it to end up not being all that close.
^Clinton will win NH, and it might be to the left of ME-02, but not ME as a whole.
While you are probably right about NV, I won't bank on it yet.
Clintons firewall is the 273 electoral votes she would get from securing PA, WI, MI, NH, CO and VA. Those all look rock solid for Clinton unless something dramatic happens. She doesn't need NV, IA, FL and OH, but they would be nice to win, if nothing else then to create an illusion of a large dem firewall. NC, GA and AZ are just for giggles, setting the dems up for the elections in the 20's when they likely become true swing states.
*ahem* I believe you mean "freiwal"