Defense Minister Ehud Barak called on Prime Minister Ehud Olmert on Wednesday to leave his post or prepare for early elections. Israeli officials say they are concerned that Iran may attack Israeli targets abroad in an effort to derail the renewed peace negotiations with Syria.A senior Israeli source, who took part in the unofficial Turkey-mediated talks between Israel and Syria, has said that the two sides are currently discussing a peace deal based on the 1967 borders.Three mortar shells were fired from the Gaza Strip towards the western Negev on Wednesday afternoon, following early morning barrages of over a dozen shells from southern Gaza. Barack Obama's campaign said on Tuesday that the candidate