CNN/Opinion Research Corp. showing Obama moving into the lead over Clinton:

Obama 50 ( +2 vs. last poll Feb 15-17)
Clinton 46 (-4)

Rasmussen Reports, meanwhile, has a closer race, with Clinton just barely on top:

Clinton 46 (-1 vs Feb. 20 poll)
Obama 45 (+1)

Clinton's lead in the RCP Average for TX is now under a point.