In a hypothetical matchup of Davis vs. a noncandidate, the noncandidate always has the advantage of no negative ads or negative press against him because he was irrelevant.
Davis has spent $16 million against Simon, but Davis is only leading by a few points at most among the general population. Davis spent only $10 million against Riordan, and he lost by a wide margin to Simon in the primary. The negative ads would have easily hurt Riordan. Conservatives never liked him, and liberals will stick with Davis.
Yes, I think Simon will keep it close, which makes me even more angry because Riordan would have blown Davis out of the water. The fact that a conservative like Simon can keep it close in CA is proof of how weak Davis is.