Obama is not so much pro-Hamas as he is anti Jew.
obama consistently supports the most radical muslim side in any conflict, whether it is green-on-green or green-on-civilization.
Given any choice, he has NEVER supported a non-muslim, or a moderate muslim in any conflict.
"I will stand with them [the muslims] should the political winds shift in an ugly direction." Barack Hussein Obama, The Audacity of Hope, pages 260- 261.