Two Russian nationals visited Colorado in 2014 as part of a larger effort to gather intelligence on swing states, undermine the U.S. political system and, eventually, support Donald Trump’s presidential candidacy, according to an indictment of 13 Russians released Friday by special counsel Robert Mueller. The charging documents say the two were trying to get information on Colorado and other so-called purple states — which have a near-even mix of Democratic and Republican voters — as part of their research. Colorado came into focus for the broader group of defendants, the indictment indicates, after they spoke with a person affiliated with a Texas-based grassroots organization who told them that they should center their activities on states like Colorado, Virginia and Florida. The indictment also follows earlier reports of Russian-linked actors trying to digitally scan Colorado’s election system for weaknesses.