In DL we really like Pizza Port. Good food and large portions. We also really like Rancho Del Zocalo (we try to eat here every trip), we really like the food and again, large portions, I get the grilled veggies with mine instead of the beans. YUM!
In DCA our favorite is Taste Pilot's Grill, another one we try to hit every trip. The food is just YUMMY!!!! good burgers, good chicken, good ribs, great condiments and the fries are criss cut, my fave! Sooooooooooo yummy!!! We also like Corn Dog Castle in DCA.