There are also numbers that suggest the more conservative states, such as Texas, are becoming more liberal over time. I would almost wager that Texas, at it's current growth rate, could be a swing state by the 2020 Presidential Election.
Such efforts didn't exist in Texas this time around because it wouldn't have been enough for this election for Obama to have a chance there. But things could be very different in 2020. Of course, it will also depend upon the two candidates and the general political climate at that time.