In earlier primaries, Obama carried Republicans by big margins, for example:
But in tonight's primaries Obama's margins among Republicans were much lower. In Texas, they went for him 53-46, and in Ohio, he barely won them, 50-49. The difference in these results may well have been enough to put Clinton over the top in Texas and (less likely) Ohio.
Could this be the result of Rush Limbaugh and other conservative pundits encouraging Republicans to vote for Hillary Clinton in order to keep the Democratic fight going and because they think she would be the weaker candidate in November?