She'll be Mayor of Chicago if she runs for anything.
More likely I see them both retiring to Hawaii after Sasha graduates high school in 2019.
Why would she run against Rahm Emanuel? Rahm was Obama's Chief of Staff and nationally, he's on very good terms with the Democratic Party. I mean she could run on Rahm's horrible education cuts, but on the plus side, he's drastically reducing homicide rates as Mayor with the help of his gun legislation which Michelle Obama supports.
She certainly won't run for Senate, either. The Obama's will be done with Washington after 2017, at least for the time being. Besides, Kirk is by far one of the best Senate Republicans right now and he works great across the aisle. It would be a benefit to have a D+1 sure, but the IL Dems have other candidates waiting in the wing. Michelle would be a strong candidate if she does run down the road. Make it worth while and knock out a Senator who can be defeated and who deserves to be defeated.