why won't he sanction Iran?

Obama attempts to delay Iran sanctions
Jewish Policy Center Deputy Executive Director Jonathan Schanzer writes that Pres. Obama is ducking a tough choice about imposing sanctions on Iran:

Legislators are growing increasingly frustrated with President Barack Obama's seeming unwillingness to pull the trigger on an Iran sanctions package that is already locked and loaded. The American public should be frustrated, too.

The Iran Refined Petroleum Sanctions Act (IRPSA), if enacted, would put the squeeze on foreign oil companies that currently help the Mullahs refine petroleum, as well as the insurance companies that underwrite this trade. If the sanctions work, they could stem the flow of 30 to 40 percent of Iranian oil, since the Mullahs don't actually have sufficient refining capacity to meet their domestic needs. In short, IRPSA could deal a fiscal body blow to Iran and destabilize the regime, as a means to derail its nuclear ambitions.

So, why are Democrats like Senators Chuck Schumer (NY) and Chris Dodd (CT) unhappy? The same reason why Republicans ar