#' @param campaign_cycle An even-numbdered year in YYYY format. Presidential data:
#' 2008-present; Congressional data: 2000-present
#' @param key (character) your Propublica API key; pass in, or loads from .Renviron as
#' \code{PROPUBLICA_API_KEY}. See \code{\link{rtimes-package}} for info on rate limits.
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