Suppose 2008 were a three-way race between McCain, Obama, and Clinton. Which states would each candidate win?
Using the available polling data, let's make two basic rules:
1. For a state to be "won" by McCain, he must beat both Clinton and Obama in the polls.
2. For either Clinton or Obama to "win" a state, they must both:
a. beat McCain and
b. outpoll the other Democratic candidate.
Using that criteria, what do we get?
McCain: 233
Obama: 191
Clinton: 114
This gives us an idea not only of the relative strengths of the two Democratic candidates, but also of McCain's strength.
So who's more electable? Clinton or Obama? The answer is neither; they both have about an equal chance of pulling off a win in the Electoral College.
Combined, the two Democrats receive 305 electoral votes - more than enough to win. But there are only 15 states (plus DC) where both Obama and Clinton beat McCain:
California - 55
Connecticut - 7
DC - 3
Delaware - 3
Hawaii - 4
Illinois - 21
Maine - 4
Maryland - 10
Massachusetts - 12
Minnesota - 10
New Jersey - 15
New York - 31
Pennsylvania - 21
Rhode Island - 4
Vermont - 3
Washington - 11
Total - 214There are three states where Clinton leads McCain and Obama does not:
Arkansas - 6
Ohio - 20
West Virginia - 5
Total - 31This gives Clinton a total of 245 electoral votes.
There are seven states where Obama leads McCain and Clinton does not:
Colorado - 9
Iowa - 7
Michigan - 17
Nevada - 5
New Mexico - 5
Oregon - 7
Wisconsin - 10
Total - 60This gives Obama a total of 274 electoral votes, enough to win the election, though it's worth noting that some of the margins are very close (and, of course, it's only May).
As for the McCain states, there are eight where Clinton outperforms Obama:
Alabama - 9
Florida - 27
Kentucky - 8
Louisiana - 9
Mississippi - 6
Missouri - 11
Oklahoma - 7
Tennessee - 11
Total - 88With Florida (a very close state in a Clinton-McCain matchup) added to her count of 245, Clinton wins the election with 272 EVs.