What challenge does President Obama face regarding Iran and diplomacy?

The challenge surrounding President Obama's diplomatic efforts with Iran primarily stems from domestic politics affecting his administration's ability to engage effectively in negotiations. This refers to the opposition he faced from various political factions within the United States, including Congress and public opinion, which often had strong views on Iran and its nuclear ambitions.

Domestic political pressures can influence the degree to which a president can pursue certain diplomatic avenues, as lawmakers may push for more aggressive stances or lack of compromise. This can complicate efforts to reach a diplomatic resolution, as the administration must balance international negotiations with the expectations and demands from domestic political stakeholders.

Therefore, while there may be other important factors at play, including international relations and economic conditions, the primary challenge in this context focuses on how U.S. domestic politics shape and potentially hinder the diplomatic craft with Iran.