I believe that the ERJ-145 is perfectly capable of flying a route from SFO to cities in the Pacific Northwest. American Eagle initiated seasonal CMH-MIA service, which is about a 2 1/2 hour flight. So I think that SFO could have ERJ flights to the Pacific NW.
The LR(Long range) doesent mean that its range is
much longer then the basic 145, this LR versin hase
got better engine fore longer flight and a bit more
fuel(not much more), if they would have too much
feul the aircraft would become less efficent.
The LR version hadse got some sort of engin that
Continental hase wanted fore its longer flights over
warm cityes(l think) ??