Daniel Palazzolo

Democratic presidential candidate South Bend, Indiana Mayor Pete Buttigieg greets Iowa voters while arriving at a campaign event December 08, 2019 in Coralville, Iowa. Less than two months remain before Iowa holds its caucuses in the nation's first contest in the 2020 presidential election. (Win McNamee/Getty Images)

Candidates say they want to build momentum with voters — but what is that actually worth?

Daniel Palazzolo, Ernest B. McGowen III