North Carolina carries more delegates than Indiana. Obama is well ahead in NC, and it's a dead heat in Indiana. If Hillary loses both then the pressure on her to pull out will be huge. His win in NC will wipe out the 10 delegates she gained in PA. With Indiana that close, whoever wins there will only gain 3 or 4 delegates. This 'nip tuck' delegate gain and loss will continue to the end.
The difference is that Obama is currently 135 delegates ahead of her. If it was a 20 or 30 delegate lead, it would be different. But at the end of the process, he will have won more states than Hillary, he'll have more of the popular vote than Hillary, and he'll have a delegate lead of about 120 with a lot of senior Democrats endorsing him.
I think even when the race is on between McCain and Obama, Hillary will still be out there campaigning!
