In the first weekend of 2020, seven Democratic presidential candidates blew through Iowa like a snow squall. Elizabeth Warren appeared in Manchester, Maquoketa, Davenport and Dubuque. Bernie Sanders also stopped by Dubuque, in addition to Grundy Center, Mason City and Boone. Joe Biden logged significant miles around the Hawkeye State as well, visiting Waterloo, Davenport, Grinnell, Vinton and Des Moines.