Sam and Zed are engineers. They work at an unidentified company with Damon, a young conservative coder, and Jan, a young liberal marketer. Damon and Jan are involved romantically, too. They are complete political opposites but sometimes find themselves united in their disdain for politicians on both sides of the aisle. Sam and Zed, the "older couple," are both somewhat conservative, but they tend to share a chuckle at the youngsters' expense.
Zed was a sniper in a past life, but he doesn't talk about it. We've seen hints in the past and once two military guys shooting a .50 at a public range recognized him.
This comic occurs after Zed has just proposed marriage to Sam, who's been in a funk the last few days before that. She accepted his proposal, which is good, but getting to one knee threw his back out, which is bad. There. . . now you're all caught up!