Obama was elected on promises to end the wars and bring the boys home. He has partially accomplished this. Afghanistan is still a large issue. If America attacks Iran, then he will not only have a bigger war than before, but the Iraq war would be reignited. In ohter words, Obama would deliver the mideast in flames and America over stretched and up to their neck in wars in three nations. This would end Obama's presidency, but, more importantly, it would kill many thousands of people and cost trillions of dollars. The good news is that will not likely have much effect on Israel. Israel will just get things started and then slip away.
U.S. Democratic Sen. Bill Nelson announces support for Iran nuclear deal (Haaretz)
from the article: U.S. army chief heads to Israel as fears over attack on Iran mount