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I think Rubio is doing what every politician, Republican and Democrat, have done...visiting Israel to affirm their "unshakable commitment to Israel's security." Those are the then Senator Obama's words when he visited Israel in July 2008 as a candidate for the Democratic nomination and at the time was trailing Hillary Clinton in the polls amongst Jewish-American voters.
As per the Guardian
, during his trip, Senator Obama also visited Ramallah, in the occupied West Bank, where he met the Palestinian president, Mahmoud Abbas, and his prime minister, Salam Fayyad. He also flew by helicopter to the southern town of Sderot where he met with Tzipi Livni, the Israeli foreign minister, and Ehud Barak, the defence minister. He was given a tour that included visiting a house damaged by rocket fire and met an Israeli boy who lost a leg in another missile attack. He also added the obligatory visit to the Western Wall, the Jewish holy site inside the Old City in East Jerusalem.
The candidate Obama scored good political points on that visit, and it probably helped him to win the nomination and the presidency. Senator Marco Rubio has no doubt looked at what Obama accomplished on that visit and will try to replicate it.