Obama has held a big lead in North Carolina in recent weeks, so most attention seems to be focused on Indiana, where the polls have given a slight edge to Clinton.

Obama was in Indiana last night and is there again today, while Clinton will be in the Hoosier State much of the rest of this week.

Looking past the pair of May 6 primaries, there is West Virginia on May 13.  One would have to give a strong edge there to Clinton.

But do we even get there?

Obama will have yet another chance to end this race on May 6, if he could win both Indiana and North Carolina.  But if they split those two states, then we go on for another week.

That's basically the Nightmare Scenario for Democratic Leaders, a sort of modern take off on the Saturday Night Live skit with John Belushi that was called, "The Thing That Wouldn't Leave."

Clinton telegraphed to reporters on Tuesday that she wasn't going to consider pulling out of this race even if she only won a narrow victory in the Keystone State.

So what do the superdelegates do now?

Some of them will certainly decide to choose up sides after this long awaited primary matchup, while others will cool their jets for a few more weeks.

Right now, over 300 superdelegates are still uncommitted.

And remember, neither Obama nor Clinton can win the nomination without the votes of superdelegates.  Clinton simply needs more of them to win.

Indianapolis, Raleigh, Charleston, Lexington, Salem, Helena and Pierre may all become frequent datelines in your local newspaper.

The primaries end on June 3 with Montana and South Dakota.  It really won't surprise me if Clinton goes all the way to the end.