On the wall above his office cubicle, Alex Seitz-Wald displays mementos from his journalism career. Framed behind glass are dozens of press badges from the decade he spent as a political reporter for NBC News in Washington, D.C. Mr. Seitz-Wald hasn’t left journalism, but earlier this year, he did make a drastic career change. He quit NBC and took a job as deputy editor of The Midcoast Villager, a weekly newspaper in Camden, Me., with a circulation of about 5,000.