Pelosi’s retirement announcement could open floodgates for a wave of new candidates

Pelosi, who has served in Congress since 1987, already had two primary challengers ahead of her Thursday announcement. More candidates are expected to join the race.

​ Pelosi, who has served in Congress since 1987, already had two primary challengers ahead of her Thursday announcement. More candidates are expected to join the race. Read More Breaking News, Latest News and Videos | CNN