First lady Michelle Obama made a charming appearance on CBS' "Late Show with David Letterman" last night.  She discussed everything from her father's battle with multiple sclerosis to which family member takes the dog out for walks.  Check out a clip from that appearance, plus some of our favorite Michelle Obama moments from recent weeks.

Stealthy Target run - It may be difficult, but the first lady occasionally gets to do "normal" things, like taking trips to Petco.  Hear her tell David Letterman about an incognito trip to Target, and how she almost got caught.

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