After returning from Alaska and renaming Mt. McKinley to Mt. Denali, President Obama will stop over in Chicago.
Since Chicago, and its eight million people, is the largest city on Lake Michigan, and deserving of recognition for this fact, it is felt some honorarium is in order. And, it is felt appropriate that one of Chicago's own and best known personages should represent the people of Chicago in this endeavor.
Therefore, after the trip to Alaska and the short stop over in Chicago, forever thereafter Lake Michigan will now be known as Lake Obama.
Its in the spirit of things.