<<(from Epicurious.com)
MASHED POTATOES
Don't try beating potatoes in a food processor: the fast spinning motion
will develop the gluten in the potatoes and turn them into a gray,
sticky mass. You can use an electric beater if your potatoes are mealy
=E2=80" russet or Idahos. For information on choosing and handling
potatoes, click here.>>

i did the same thing with a stick blender! ick! never again!