I will keep this short, because I'm sure there are others that can provide a more in depth analysis than I can, but I wanted to point out two new polls that were just released. In two Washington Post/ABC News polls - available here - Clinton and Obama are statistically tied in Texas, while Clinton holds a narrow (and narrowing) lead in Ohio.
Texas (2/16-20/08)
Clinton: 48
Obama: 47
(M.o.E. +/- 4%)
Ohio (2/16-20/08)
Clinton: 50
Obama: 43
(M.o.E. +/- 4%)
I can't find past polls for comparison at the moment, but these polls reflect the closest point that Obama has gotten in either state in recent days.
If I were Hillary Clinton, I would be seriously concerned.
UPDATE: I just noticed that both of these polls were largely taken before Obama's February 19th victories in Hawaii and Wisconsin and I can't help but wonder if Obama has actually taken the lead in Texas. Time will tell...