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No doubt they do, but the point most people seem to be missing, is that in aggregate, there are more delegates from this weekends elections and the rest of February, than Ohio and Texas combined. What does this mean? That means if Clinton keeps bleeding delegates the way she is this month, she would have to seriously wipe the floor with Obama to catch up in delegates. An "okay" performance in Ohio and Texas (ie: like New York or California, where he got 40 or 42%) is not going to cut it for her campaign.
Things could turn around. If she does well in Wisconsin, it would help. If she cuts him to a draw in Virginia, Maryland, and D.C. But it seems, almost, that Clinton has conceded those states, and is merely content to let "Ohio and Texas" decide. It's like the Florida strategy writ large.