Actually she's still holding onto a lead in Ohio and Texas is a toss-up, if the Republicans (whose votes won't otherwise matter, Ron Paul notwithstanding) actually do turn out for her at all, it could turn the tide there and then the games are on big time.
So far she does have one big thing going for her which is that she was the winner in the big electoral states that are Blue strongholds. Obama has won a lot of places that are either small or will likely go Red in the GE. Due to the way the Electoral College works, distribution of votes in the state-by-state popular-vote Primaries does not necessarily match up with a winning scheme in the General.