"One is not considered a scholar unless he is able to purify the impure," our sages teach us (see tractate Sanhedrin 17a and the Meiri's commentary). One has to give credit to President Obama, for he apparently is doing precisely that. He is brilliantly using his influence behind the scenes to twist the arm of Hamas and get them to agree to a unity government in a cosmetic coalition with the PA (Fatah). As such, according to the Laws of Mixtures (see Shulchan Aruch, Yura Dea, Chapter 98, clause 1), Hamas loses the name of Hamas (unkosher) and the entire mixture with Fatah (kosher, according to the USA) is rendered Kosher as the "Palestinian Authority".
Good try, President Obama, but it's not so simple. If you are discussing 2 separate species, and the minority unkosher type mixes with the majority kosher type, then the entire mix is rendered kosher as long as the minority unkosher type is completely blended and indistinguishable from the majority kosher type, according to the Torah. Yet, Rabbinical Ordinance requires that the minority unkosher type be no more than 1 part in 60 for the entire mix to be rendered kosher.
As such, President Obama's attempt to make the Hamas "Kosher" by encouraging a unity government with the Fatah does not succeed for the following reasons, according to Jewish Law:
1. The Fatah does not have a majority over Hamas, much less 60:1.
2. The Fatah in itself is not kosher, but just as much terrorists as Hamas. (Remember, The Tanzim and the Islamic Jihad are part of the PA and Fatah, and not part of Hamas.)
Smooth rhetoric and demogoguery works on the masses, but it doesn't reflect truth. President Obama and his advisors will have to learn much more Gemara before they'll be able to purify the impure.