So far, 16 members of Congress—eight Democrats and eight Republicans—have announced they are retiring from public office before the next election. And there could be more as retirements tend to spike after the holidays.

While much of the retirement attention has been on the Democrats, who lost their only chance of holding on to a Senate seat in solidly red West Virginia, and a handful of House members who had success in swing districts, political experts say that the surge of retirements could spell bad news for Republicans.