Al,
I was actually going to insinuate that.
Gabu,
Yes, but one could argue that it's a matter of what principle one believes should be used rather than what particular group should be favoured.
RBH,
I'm not so sure. First off, what's left once you've covered swing areas AND bases? Secondly, the pay-off on an ad campaign or whatever in a rural area is much, much lower than in an urban area. 90% of 1000 voters is still less than 40% of a million. And so on.
Also, it is fully possible that a state such as Wisconsin is 45 R-45 D-10 Undecided while, say, Idaho is 65-25-10. In that case it isn't necessarily better to campaign in Wisconsin than in Idaho. The point is that a safe state must not necessarily have fewer swing voters than a swing state. It may just have more safe voters for the other side. Therefore the traditional swing states would not necessarily get any attention in a national race.