The US public doesn’t want a war with Iran and supports the diplomatic avenues finally opened by our administration. See Susan Lazare’s article on Juan Coles’s Informed comment. Key passages:

According to the latest count, 59 senators—16 of them Democrats—have thrown their public support behind the Iran Nuclear Weapon Free Act of 2013 (S. 1881), which would advance further sanctions on Iran and impose near-impossible conditions on a final agreement — in what critics, including the Obama administration, say amounts to a call for war.

Many organizations are calling for diplomacy and pressuring those 59 senators to consider realities:

Sixty-two organizations …. released an open letter (pdf) to U.S. senators declaring, “By foreclosing diplomatic prospects, new sanctions would set us on a path to war… We strongly urge you to withhold co-sponsorship of S. 1881 and delay consideration of new Iran sanctions while negotiations are ongoing.”

Realities: the 2003 war against Iraq had disastrous consequences, and the war-type sanctions meant to bully Iran into submission and curtail its potential power in the region haven’t achieved the goal. More of the same would make it unlikely for Iran to exercise their power and help with Syria, Kurdistan (in common with Turkey), proper constitution in Iraq, security in Afghanistan and Pakistan. It means sharing resources in the Persian Gulf area. It means more important actors being engaged in this redistribution of resources, especially Russia, China and India. The plurality of actors could be good for peace and help the US negotiate the difficult and necessary down-tuning of its military power. Diplomatic progress towards a multi-polar world would mean greater security for everyone, including Israel.