Folk songs, tears and zippy one-liners: On the trail with the longshot candidate trying to oust Duncan Hunter

Retired FBI agent Jeff Iverson had his doubts about Ammar Campa-Najjar, the 29-year-old Democrat whose race to unseat Republican U.S. Rep. Duncan Hunter took on an unexpected importance after federal prosecutors charged Hunter and his wife with stealing $250,000 in campaign funds.

“It’s not his…