With Prospects Bleaker, Netanyahu Lashes Out
Prime Min Benjamin Netanyahu fights for his political survival in Israel, with only ultra-Orthodox Jewish community standing nearly unanimously by his side; his candidacy is bleeding support from other core constituencies: Sephardic Jews, secular right-wingers and Russian immigrants; many observers believe his behavior is panicky, as though he is on the ropes; in recent appearances, he has lashed out at the left, the elite, the media and polls; Netanyahu is trailing his main opponent, Ehud Barak, by solid 8 points in latest polls; some conservative analysts now suggest that Barak, Labor Party leader, could win clear majority in May 17 vote, obviating need for anticipated runoff on June 1; photos (L)