By Patrick Martin in the USA:
Obama builds lead over Clinton after North Carolina, Indiana primaries
7 May 2008
Senator Barack Obama increased his delegate lead over Senator Hillary Clinton in the contest for the Democratic Party presidential nomination with a split in the two primaries held Tuesday, winning easily in North Carolina and losing more narrowly in Indiana.
Obama also increased his lead in the total popular votes cast, winning North Carolina by a margin of several hundred thousands votes, while the contest in Indiana was neck-and-neck, with predictions of a Clinton margin of less than 20,000 votes.
North Carolina is the larger of the two states, with 134 delegates compared to 72 for Indiana. While final delegate totals, based on the votes for the candidates in each congressional district, would not be available until Wednesday, it appeared that Obama would add as many as 20 delegates to his current lead of 136.
See also here.