What seems to have swung it for Clinton in Texas is that while Obama came in first among the men, Clinton came in first among the women - and there were a great deal more women than men voting in the Democratic primary - 53% women voters and only 43% men,(whereas in the Republican vote it was pretty even - 49% women, 51% men).

And the same seems to have been the case in Ohio, where there were 59% women and only 41% men Democratic voters. (Whereas among Republicans it was 54% men,and only 46% women.) And once again Obama got a majority of the men voters in the Democratic primary.

It rather looks in both cases as if a lot of women who might have been expected to vote Republican came out to vote for Clinton. Interesting.

(Figures taken from this site, CNN Election Center.)