Former Democratic presidential candidate Andrew Yang pauses during a rally at the Lincoln memorial. (David Fisher/For personal)

A supporter of Andrew Yang holds a sign. (David Fisher/For personal)

The “MATH” sign was one of the slogans of the Yang campaign. (David Fisher/For personal)

Andrew Yang speaks to the crowd at the Lincoln Memorial. (David Fisher/For personal)

Supporters of Yang hold signs behind the candidate. (David Fisher/For personal)

Andrew Yang greets supporters. (David Fisher/For personal)