Political campaigns are expensive.

Candidates travel across the country to meet voters, buy ad spots on TV and social media, and hire staffers. Donations are one of the major ways these candidates fund their operations — and they're getting smaller.

Candidates are pushing hard for supporters to give as little as $5 as public opinion shifts to opposing large donations from the super-rich and political action committees. A large pool of small donors is now seen as an accomplishment in its own right. What's more, new debate rules for the Democratic candidates place a huge emphasis on small donations.

Watch the video above to find out more about how small donations are changing the 2020 political landscape.