I think the Wall Street Journal's Jay Solomon is overselling this story of increasing criticism of Sen. Barack Obama's alleged "radical departure from standard U.S. doctrine" regarding negotiating with rogue leaders, but Karim Sadjadpour makes a good point here:

If Obama comes into office in January 2009, I wouldn't advise him" to hold talks with [Iranian President Mahmoud] Ahmadinejad quickly, said Karim Sadjadpour, an Iran specialist at Washington's Carnegie Endowment for International Peace, who said he is generally supportive of Sen. Obama's agenda. "Only two things can rehabilitate Ahmadinejad politically: bombing Iran or major efforts to engage" him ahead of the vote.

My hope is that Obama doesn't literally mean he will sit across the table from Ahmadinejad, but rather that he won't be afraid to negotiate with Iran and will drop preconditions that only ensure that talks will go nowhere. But it's worth pointing out that the United States has tried in the past to ignore Iran's power dynamics and negotiate with its preferred interlocutors. That approach simply doesn't work, because the hardliners will work to torpedo any deal that doesn't include them. Plus, they've got Ayatollah Ali Khamenei on their side, and he's the big boss. There will be no deal without his approval.