article_snippet: Former Texas Gov. Rick Perry spoke at the 2015 Ag Summit, a testing ground for presidential hopefuls, in Des Moines, Iowa .
article_snippet: LIberal activists from family-farming and animal-rights groups picketed outside the Iowa Ag Summit on Saturday .
article_snippet: Eight other Republicans spoke Saturday, including Wisconsin Gov. Scott Walker, former Florida Gov. Jeb Bush and Texas Sen. Ted Cruz.
highlights_snippet: Perry spoke at the Iowa Ag Summit, a farmers' casting call for prospective presidential candidates .
  