I don't like Castle either, but we're 9 down in the Senate and we need the numbers. Sure, DE voters can knock off one of their prizes and probably will (with Dems' help today), but what does that produce? A win for the Dems in November. We're either going to have the numbers or ideological purity. We're not going to have both.
Delaware is a closed primary, so no “help” from the RATs. None asked, none given.
And why the fascination with the numbers when they are unreliable at critical times? It makes no difference how many Rs there are, if half of them are McCains, Grahams, Snowes and Collins?