The August 28, 2013 version of the data includes the addition of non-survey variables, including
variables from the Web mode Core Profile data, and, for face-to-face cases, variables for Pre and Post
interviewer observation,> interviewer description, household selection, and dwelling unit description.
Two face-to-faces cases, 0523 and 1826, have been dropped from the dataset
as ineligible, and Post-election survey data for (face-to-face) case 1496
have been deleted due to a problem in the post-election administration.