There really isn't any way Hillary could win Mississippi, even against Palin. Remember, Mississippi is the most inelastic state. If Hillary is doing well enough to win Mississippi, she's also winning Utah and Wyoming. 1
"Most inelastic state" (which is a pretty dubious designation based on very small sample size as it is) is not the same thing as "the last state to flip to the Democratic side."
It just means that Mississippi is the least susceptible to moving to national trends. However, because of Mississippi's relatively high Democratic floor, it would still be much easier for Hillary to win Mississippi against Palin than a state like Utah, Wyoming, Kansas, etc.
