In the whole scheme of things it did not hurt the GOP one iota to lose Delaware.
Whether the GOP has 41 seats or 50 seats, the GOP has the same power.
The GOP now has 47 seats and Delaware makes no difference.
The Establishment GOP needs to get their heads out of the sand otherwise they will be the next ones ousted from DC.
And, had Castle been the 48th seat, he would've voted with the Democrats anyway -- gaining the party nothing.