SACRAMENTO, Sept. 26 — Senator Dianne Feinstein was asked last month why she supported Gov. Gray Davis in his recall fight, when a decade ago Mr. Davis compared her to the jailed tax evader Leona Helmsley in a widely criticized campaign commercial."Lesson learned," Senator Feinstein said of Mr. Davis on the NBC News program "Meet the Press." Pressed further, she added: "I hope so. I believe so."Ms. Feinstein, who defeated Mr. Davis in the 1992 Democratic Senate primary, now speaks confidently of him as a changed man, someone who has seen the error of his ways both as a candidate...