Key poll in early voting state has five US Democrats emerging

As the two dozen Democrats aspiring to the US presidency struggle for attention, a new survey in the first state to vote in 2020 shows five of them, led by former vice president Joe Biden, emerging with early leads.The CNN/Des Moines Register/Mediacom poll of Iowa voters comes a full eight months before they convene in caucuses to pick a favorite, but it carries weight since Iowa's early voting status helps shape voter impressions nationwide.Virtually tied with Sanders are Senator Elizabeth Warr