A day after she announced a presidential exploratory committee, Sen. Elizabeth Warren unveiled plans to visit four Iowa cities this weekend. She will be in Council Bluffs, Sioux City, Storm Lake and Des Moines, the committee said. She is the first major Democratic contender to take formal steps toward a 2020 election bid. Warren has had a presence in Iowa in recent weeks and has spoken to officials and other major Democratic players, Politico reports. Iowa is the first state to vote in primary elections.