It's a matter of convenience:
[I]t is the smallness of Delaware, and its proximity to Washington DC, that makes it attractive to Gingrich. No plane tickets are required; the former Speaker can ride Amtrak from his home in Virginia — that's how he is getting there for a campaign event Monday — and can easily drive from place to place. "It's a state where we can get around," says Gingrich spokesman R.C. Hammond. "It matches our budget, if you will."
Ed Morrissey is puzzled:
Assuming Romney gets to 850 tomorrow, he’ll need less than 300 delegates to get the nomination secured. Besides Texas, where he will pick up at least 100 delegates even if he loses the state, there are 292 delegates at stake in upcoming proportional primaries, and Romney will win at least half of those, if not most. Add that to the winner-take-all contests in California (172, by CD), New Jersey (50), and Utah (40), and Gingrich doesn’t have a prayer of stopping Romney, win or no win in Delaware. The only people who can’t do this math are on Team Gingrich.
The Dish 