Sen. Cory Booker, D-N.J., attends the annual Martin Luther King Jr. Day at the Dome event on Jan. 21 in Columbia, S.C. Booker and many other Democratic presidential hopefuls have made visits to the state in the early weeks of the 2020 campaign.

Sen. Cory Booker, D-N.J., attends the annual Martin Luther King Jr. Day at the Dome event on Jan. 21 in Columbia, S.C. Booker and many other Democratic presidential hopefuls have made visits to the state in the early weeks of the 2020 campaign