Let's put it like this, Childers has about as much chance of winning as the overrated Terri Lynn Land and the extra overrated Scott Brown. Not impossible, but not likely under regular circumstances. Republicans are far more confident about winning blue state seats that Democrats are about winning red states.
Childers is not as strong as Land and nowhere near as weak as Brown
I don't know enough about Land to judge that statement, but Childers is the 2nd strongest candidate the Mississippi Democrats could possibly have (behind Hood). That may not be enough, but at least we're actually trying to win a seat for once.