#' A data.frame containing election results from the 2012 US Presidential election.
#'
#' @name df_president
#' @usage data(df_president)
#' @docType data
#' @references Taken from the FEC website on 11/21/2014.
#' @keywords data
#' @author Ari Lamstein and Richard Careaga
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#' A data.frame containing population estimates for US States in 2012.
#'
#' @name df_pop_state
#' @docType data
#' @references Taken from the US American Community Survey (ACS) 5 year estimates.
#'
#' @keywords data
#' @usage data(df_pop_state)
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#' A data.frame containing all US presdiential election results from 1789 to 2012
#'
#' Legend:
#' \itemize{
#' \item R = Republican
#' \item D = Democratic
#' \item DR = Democratic-Republican
#' \item W = Whig
#' \item F = Federalist
#' \item GW = George Washington
#' \item NR = National Republican
#' \item SD = Southern Democrat
#' \item PR = Progressive
#' \item AI = American Independent
#' \item SR = States' Rights
#' \item PO = Populist
#' \item CU = Constitutional Union
#' \item I = Independent
#' \item ND = Northern Democrat
#' \item KN = Know Nothing
#' \item AM = Anti-Masonic
#' \item N = Nullifier
#' \item SP = Split evenly
#' }
#' @docType data
#' @references Taken from \url{http://en.wikipedia.org/wiki/List_of_United_States_presidential_election_results_by_state} 3/20/2014.
#' @keywords data
#' @name df_president_ts
#' @usage data(df_president_ts)
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