This week, the Obama administration will host a Middle East summit. But how can any progress be made when two different groups control parts of the areas designated for a Palestinian state and those groups are at war with one another? What are the major difference between Hamas and Fatah? What can reasonably be expected this week? And what will the Obama team be hoping to achieve? We ask Jonathan Schanzer of the Foundation for the Defense of Democracies and author of “Hamas vs. Fatah”.