I wouldn't consider Pombo vulnerable. The Democrats running are nobodies. Petey McCloskey's challenge from the Josef Stalin/Vito Marcantonio wing of the GOP is a hoot and a half. He needs to go back to the senile citizen's home before he hurts himself.
If the Dems are nobodies, Pombo is a very lucky man. I still think he is in trouble. Write that down. I put him in the shaky leaning GOP column.