Just to clarifly, I'm not suggesting that Obama could have won Texas this year, but my feeling is that democrats would be well advised to start swaying over Texas voters. McCain carried the state by 12 points, but Texas wasn't contested and have lots of latino voters. If democrats want to turn it around at some point, they should start investing.
I agree, the Dems should try to keep on diminishing Latino vote for GOP and so, invest heavily in TX, in order to force Republicans to defend the Lone Star state, their only big state (vs CA and NY and IL for the Dems).
Apart from TX, of course: AZ, MO and GA.
And better for Obama to fight to solidify OH, FL, VA, NC, IN than to go on the offensive in ND, SD, MT, NE-2, MS or WV.