What if the United States invaded Iran during the Global War on Terror?

United States Army general and presidential candidate Wesley Clark wrote in 2003 that in November 2001, a senior military staff officer at the Pentagon informed him of a planned American invasion of Iran, not long after the invasion of Iraq.

Suppose that the government followed through, and on August 30, 2004, explosions were heard in Tehran, as the United States, alone, invaded the sovereign nation of Iran.

What would this mean for that year’s election? And what course would the war take, in your opinion?