UPDATE 1-Netanyahu says Israel ready for Gaza campaign if needed; Palestinians plan huge march

GAZA-ISRAEL BORDER, March 28 (Reuters) - Prime Minister Benjamin Netanyahu said on Thursday that Israel is prepared to wage a broad military campaign in Gaza if needed, after a two-day flareup of cross-border fighting that has thrust his security policies to the fore two weeks before an election.In Gaza, organizers announced plans for a massive protest on Saturday along the border to mark the anniversary of weekly demonstrations at which Israeli forces have, according to Gaza medical officials,