Wasn't she virtually the acting president for some time after Reagan was shot? I think I saw something about this on a documentary. Apparently after the shooting no one wanted to admit how bad Ronnie's condition was so essentially started making decisions for him as if he were still compos mentis - when in fact he was in a coma.
edit: oh, and there's the Alzheimer's thing too. There was a lot of speculation that Reagan was already pretty far gone while he was still in office. I think she played a much bigger role than anyone will probably ever realize.
The vice President is the second in line third being the Speaker Of The House. The first lady does not have any official capacity to run the country. Perhaps make suggestions to the President. That's it.
In case anyone is interested in the line of succession.
Vice President of the United States
Speaker of the House
President pro tempore of the Senate
Secretary of State
Secretary of the Treasury
Secretary of Defense
Attorney General
Secretary of the Interior
Secretary of Agriculture
Secretary of Commerce
Secretary of Labor
Secretary of Health and Human Services
Secretary of Housing and Urban Development
Secretary of Transportation
Secretary of Energy
Acting Secretary of Education
Secretary of Veterans Affairs
Secretary of Homeland Security
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SHIT HITS THE FAN
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John Connor