I should bump this up for two things:
First, a map of the state Senate districts may be found here:
http://gis1.tlc.state.tx.us/Second, state Senate districts in Texas are drawn to benefit rural voters at the expense of urban and suburban voters.
For example, Travis County is basically one state Senate district (where Obama will win - SD 14). SD 25 is a combination of rapidly growing areas in-between Austin and San Antonio, a very small sliver of Travis County and the hyper-Republican areas of north San Antonio. I will be curious to see how this one ends up.
On the flip side, six Senate seats along the border, El Paso and San Antonio will easily be Clinton, regardless. Another 9-10 of the seats are primarily going to be dominated by rural voters (in east/west/Central Texas), and if not, will contain some suburbs, but probably not enough to have a great impact (these places tend to be Republican).
Then, the other 14-15 SDs are urban/suburban SDs. I'll have to refresh myself as to the makeup of these.