Whom can Clinton in part thank for her victory in Texas? The border counties. Aside from Brewster county (which only cast 754 votes according to CNN), she won all counties on the US-Mexico border, some by very commanding margins (e.g. 77%-21% or 83%-16%), and a significant portion of her 100,000-vote victory margin can be found in these counties. Her margins of victory in Hidalgo, Webb, Cameron, Maverick, and Starr counties (just some of the border counties) combined add up to over 90,000 votes. Throw in Nueces county, which is on the Gulf of Mexico and close to the southern border, at you're at over 100,000. Part of Clinton's success in Texas came from her ability to avoid any massive pro-Obama blowouts in the urban areas of Austin, Houston, and Dallas (the counties of which often when very strongly for Obama but without too many 70-30 splits). But part of her success also relied upon her ability to rack up massive leads in the border counties along with suburban and rural counties.