Porter Goss resigns from CIA

It was just announced that Porter Goss has resigned as Director of the Central Intelligence Agency. There must be something else behind this decision. Goss resigned from the House of Representatives and took this job a little more than a year and a half ago with a five year plan to modernize and improve the CIA. Since no specific reason was given for his resignation, rumor will be running rampant. Here is a short list of potential reasons for his departure:
1. Health - Goss is 67 years old
2. Infighting in the CIA - Goss just recently fired a CIA employee for aiding our enemies by leaking classified information to reporters.
3. Loss of power due to creation of the new position of Intelligence Chief overseeing all the various intelligence agencies.
4. Make up your own in the comments section.