That drop-off might not translate into actual votes for the two long-shot candidates, who are themselves both in their mid-60s and have stumbled with controversial or ignorant statements in the past several weeks. In an election season dominated by sexa- and septuagenarians, there are no obvious choices for younger voters to rally around, as they did with Obama in 2008. The most popular candidate in 2016 for younger voters was the oldest, Sanders, who trounced Clinton among millennials in the primaries with his forceful demands for populist change, single-payer health care, and tuition-free college. Younger Republicans like Marco Rubio and Ted Cruz fell short in their bids this year, and Clinton passed over younger Democrats like Cory Booker and Julián Castro in favor of Tim Kaine, who is 58.

What the surge in millennial support for Johnson and Stein might portend is a big dip in turnout by younger Americans, who already vote in much lower numbers than their older peers. Historically, support for third-party candidates drops as an election gets closer, and neither Johnson nor Stein is expected to earn a spot in the presidential debates. The same polls showing strong support for their candidacies also show that a plurality or, in Stein’s case, a majority of millennials don’t know much about them. For Clinton, however, the prospect of millennials staying home in November is equally as big of a concern. As Ronald Brownstein detailed in August, the generation of Americans born between 1981 and 2000 makes up an ever larger share of the electorate and has increased by 40 percent in key battleground states just since 2012.

Enter Sanders and Warren. They might not be any younger than Clinton, but their liberalism and critique of establishment politicians have galvanized millennials, and particularly college-aged voters, like no one else in the party—Obama included. The Clinton campaign didn’t mince words about what it is sending them to Ohio to do. In five separate events across the state, the senators “will emphasize Clinton’s plans to support millennials, including making free community college and debt-free college available to all Americans, protecting access to health care for young Americans, reforming our immigration system and supporting DREAMers and their families, raising the minimum wage and protecting our climate.” Clinton will address young voters directly in a speech Monday in Philadelphia that, her campaign said, will “lay out the stakes of the election for millennial voters.” And for a younger voice, the Clinton campaign said it will be sending 36-year-old Chelsea Clinton to Ohio next week.

Why Ohio? Besides being a perennial battleground and a must-win for Trump, the Buckeye State is one that has looked particularly shaky for Clinton in recent days. Two respected polls released this week have shown Trump opening up a five-point lead with likely voters, and a survey released Thursday by Suffolk University had him winning by three. The key liability for Clinton is depressed Democratic enthusiasm. She performed better among registered voters than the smaller group of Ohioans who were most likely to vote. That’s a reversal of the dynamic that both state and national surveys found in the weeks after the Democratic National Convention, when Clinton led comfortably.