By Josh Blackman and S. B. Tillman The events of Jan. 6, 2021, are casting a long shadow over the midterm elections. Voters in North Carolina are seeking to bar Representative Madison Cawthorn from running for re-election to his House seat, and those in Georgia are trying to do the same to Representative Marjorie Taylor Greene. These voters have filed complaints with state elections officials arguing that Section 3 of the 14th Amendment disqualifies members of Congress who engage in insurrection from appearing on the congressional ballot. (Challenges to other elected officials have also begun involving other candidates.)…