"Any time you see those high-profile figures in the state, that’s a sign that the congressman is taking his races seriously," says Nathan Gonzalez, editor of the Washington-based Inside Elections. "Any Republican who isn't ... does so at their own peril."
Pittenger's main challenger in the May 8 GOP primary is Mark Harris, a former Charlotte pastor who lost to Pittenger by just 134 votes in the 2016 primary. Though polls give Pittenger the edge, turnout is expected to be a big factor.
The winner is expected to meet Democrat Dan McCready in November. McCready, who faces fellow Charlotte Democrat Christian Cano in the Democratic primary, has drawn comparisons to Conor Lamb, the Pennsylvania Democrat who won a special election in a district Trump carried by 20 points in 2016.