See my post #129. Campbell polls best against Boxer. In fact, he is the only Rep who is beating her.
First you are wrong about your own poll and second, that three week old poll doesn't show much difference between Fiorina and Campbell against Boxer.
"Incumbent Democrat Barbara Boxer now receives no more than 43% support against any of her top three GOP opponents in her reelection bid for U.S. Senate in California"