This already shows how aware he is of the possible competition. Having a site right out the gate is essential these days and this one was obviously under professional development for awhile. If he had lagged in this area, I would have been worried. Nate Silver, a person I loathe, says his chances are north of 55-60% to win the seat.
Also, Beau Biden would be wise to wait. If he is and likely will be defeated by Castle, that produces a stain upon future election prospects until a good democratic year comes along. I highly doubt that year will be in the middle of the 6 year itch of Obamas presidency though - nearly every president loses a big amount of seats in the third midterm. At the same time, if Obama loses re-election, then Biden would be in a prime position for a Republican midterm, which as history shows, makes it easier in most cases (excepting Bush).
