Where are Bernie's young'uns? Welcome to the Maclean's Politics Insider: America 2020, launched for readers who crave U.S. political news during primary season. If you want to receive this new newsletter, take no action, it will arrive in your inbox every weekday at noon. If you'd rather not receive it, please unsubscribe here. The real debate loser? CBS: In preparation for the South Carolina primary next week, the Democratic candidates gathered in Charleston for yet another televised debate. And while NBC was getting most of the brickbats until recently, CBS may have seized the prize: the network's moderators struggled to keep the debate on topic, and at one point, one of the moderators mistakenly announced that the debate was over. Though coronavirus is the big topic on everyone's mind today (though the Trump White House is striving, not very successfully, to downplay it ), it took almost an hour and a half before someone asked about the potential outbreak. Among the topics covered before then: a municipal ban on big sodas, the future of the filibuster, and the Naked Cowboy who performs for tourists in Times Square. Elizabeth Warren goes after Bloomberg ... again: While Michael Bloomberg isn't on the ballot in South Carolina, Elizabeth Warren injected new life into her campaign by going after him at the last debate, so on Tuesday night, she disagreed respectfully with Bernie Sanders but went hard after Bloomberg. This time, she returned to the theme of non-disclosure agreements Bloomberg has signed with female employees who had complaints about their treatment at his company. But she also talked about the fact that Bloomberg was a not only was a Republican mayor, he also gave money to Republican candidates, including Trump ally Senator Lindsey Graham and Scott Brown (who Warren defeated to win her current Senate seat). "I don't care how much money Mayor Bloomberg has, the core of the Democratic Party will never trust him," she declared. The new Sanders voters aren't showing up: One of Bernie Sanders' main arguments for his electability is that he will attract voters who hadn't previously turned out. That may have been true in 2016, but according to an analysis by Sydney Ember and Nate Cohn of the New York Times, it hasn't happened in the 2020 primaries so far. They found no sign of a surge in turnout, or of young people coming out in large numbers. And spikes in turnout do not always match up with Sanders-friendly zones: in Iowa , increased turnout was "concentrated in more well-educated areas where Mr. Sanders struggled." To win in November, Sanders will either need to turn out more young and working-class voters, or increase his appeal to the educated professionals who fuelled the Democrats' Congressional victories in 2018 — and who are mostly voting for his primary opponents this year. What happened to Warren's ground game?: Speaking of turnout, Elizabeth Warren worked long and hard to build a turnout operation in early primary states, and it doesn't seem to have done her much good. In Iowa, Warren's "ground game" was considered the strongest in the state, and The Daily Beast was told that her team expected better than a third-place finish (behind Pete Buttigieg and Bernie Sanders ). It turned out there was a high "flake rate" of voters who told organizers they would show up to vote for Warren, and then didn't vote at all. Which may simply show that politics professionals overrate ground game as a deciding factor in elections: "Ground game in general is always going to be a marginal thing," one state-level Democrat said. "Field will get you 2 or 3 percent." —Jaime Weinman | 