Candidates for the Democratic presidential nomination kicked off the last weekend before the Iowa caucuses with late-night returns to Iowa and cable news interviews. Saturday night was marked with a surprise announcement, that one of the most-watched polls of the Iowa caucuses would not be released.

Sens. Elizabeth Warren (Mass.), Bernie Sanders (I-Vt.), Amy Klobuchar (D-Minn.), and Michael F. Bennet (D-Colo.) returned quickly to the campaign trail, with a full spate of events planned throughout Iowa — and, for Bennet, New Hampshire — through the weekend.

Already in Iowa, former vice president Joe Biden flexed his history degree, quoting George Washington to criticize President Trump and defend himself against Republicans’ accusations of “corruption.” Entrepreneur Andrew Yang, meanwhile, invoked the 1918 Spanish flu to illustrate the doomsday warning at the heart of his campaign. Meanwhile, a top surrogate for Sanders in Iowa led a crowd Friday night in booing former secretary of state Hillary Clinton, prompting an uproar between Sanders supporters and others in the Democratic Party.

Financial reports filed Friday also offered a fresh look at how much the candidates are pulling in, and how they’re spending their money. The records show the top-polling Democratic presidential candidates are spending at a rapid clip.

Get ready for Iowa’s caucuses: