Gerrymandering for Dummies

What is "gerrymandering?" It is the drawing the boundaries of state electoral districts (for U.S. Congress) in an unnatural and artificial way so as to gather together as many residents of a common socio-economic and political bloc as possible (to ensure the election of either a Republican or Democrat as their Representative).

A perfect example is the 12th District in North Carolina (ht: Mary Katherine Ham at Hugh Hewitt).