Exit polling is so close that they are not calling Texas for Clinton yet, but she's likely to win given the current totals which have Clinton up by about 2%. Exit polling is closer:
Exit polling shows this:
Male (43%) Clinton: 46% Obama: 52%
Female (57%) 53% Obama: 46%
Note even before the math that since there are more women voting than men and Clinton is winning with women more than Obama with men she's probably got it barring glaring exit poll errors.
The maths suggest the final tally is this:
Clinton: .43 x .46 + .57 x .53 = 49.9%
Obama: .43 x .52 + .57 x .46 = 48.58 %
OK, this is *so close* I can see why they are not calling it for Clinton. But President Picker is not so cautious, because we are a blog and have far lower journalistic standards than, say, Fox news. Wait .... let me rephrase that...