Barack Obama threaded his way through a minefield today, from Jerusalem's Holocaust memorial and Sderot, an Israeli town near the border with Gaza and a frequent target of Palestinian rocket fire, to Ramallah on the Palestinian West Bank. In Israel, John McCain is a known quantity and there's anxiety about what changes Obama might bring. Change is just what the Palestinians hope for. The Democratic presidential hopeful reaffirmed the special relationship with Israel and promised to work toward a Palestinian state. Did he get the reactions his campaign was looking for? What's the likely impact on American voters?