RENOWNED songwriter Kara DioGuardi joins Simon, Paula and Randy this season as a new judge. Alexis, Michael and Danny were the lucky three advancing to the Top 12 on "American Idol," following the season's first live performances. But we've been following the highs and lows of new judge Kara DioGuardi, a New Rochelle native, as she evaluates the contestants. Last week, Kara continues to prove she's a good addition to the judges' table. She's more decisive than Paula and Randy, but not as cruel as Simon. Of Casey Carlson's stiff rendition of the Police's "Every Little Thing She Does is Magic," Kara seemed genuinely sorry to report: "Everything about that was wrong." This week: Danny Gokey will probably win the whole shebang. So we don't really need to have him shoved down our throats so early in the competition. Please, Kara, ease up on the overenthusiastic table-pounding and song-inspired cliches. Danny sang Mariah Carey's "Hero," so Kara declared him the "hero" of the night and we get it. " LH