The answers to the following clues will have something in common.

1. Something bought sight unseen
2. Support one's family
3. Amateur broadcasters
4. Waste something of value
5. Enjoy the lap of luxury
6. Many a dorm room, for example
7. Acts of Congress containing political favors

Answers:

1. Pig-in-a-poke
2. Bring home the bacon
3. Ham radio operators
4. Cast pearls before swine
5. Live high on the hog
6. Pigsty
7. Pork barrel legislation

Credit: Chicago Tribune Crossword
Ed Voile - SOW SHOW