Michael Barone's breakdown of Texas (Dem. Caucus not included)

His Breakdown:

Clinton won her crucial victory in Texas, [that is a link to a very cool uselectionatlas.org] 51 percent to 47 percent.

Obama carried 24 counties, Clinton 226; one was tied, and three small counties in the northern panhandle cast no Democratic primary votes at all. Obama carried four counties with more than 60 percent of the vote—Travis (Austin: state capital, University of Texas), Dallas (blacks and upscale whites), and Fort Bend and Grimes (western suburbs of Houston, with rapidly growing black populations). Obama counties were concentrated in the Dallas-Fort Worth metroplex, metro Houston, and a ring of counties around Austin, whose denizens seem to be spreading across the countryside (the hill country west of Austin is beautiful). He carried Jefferson County (Beaumont, with the highest black percentage in Texas) and Smith and Tyler counties (East Texas, Tyler, and Longview, where most whites are Republicans and most Democratic primary voters were very likely black). Obama got an impressive 44 percent of whites' votes, probably mostly upscale, and 85 percent of blacks' votes. But he got only 35 percent among Latinos, according to the exit polls, and ran far, far behind Clinton in the Lower Rio Grande Valley, where she got 73 percent of the vote in Hidalgo County (McAllen), 77 percent in Webb County (Laredo), and 69 percent in El Paso County. You also see Clinton getting more than 70 percent in some east Texas and central Texas rural counties with low black populations: Jacksonians.