| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 |
State normalized presidential vote (SNPV) | 0.3913** (0.0845) | 0.3791** (0.0901) | 0.4269** (0.1009) | 0.3950** (0.0870) | 0.3838** (0.0928) | 0.4355** (0.1040) |
Preclearance indicator variable | 0.0151** (0.0047) | 0.0178** (0.0052) | 0.0152* (0.0059) | 0.0177** (0.0046) | 0.0210** (0.0051) | 0.0197** (0.0054) |
Bipartisan legislative indicator variable | - | - | - | −0.0008 (0.0054) | −0.0007 (0.0059) | −0.0012 (0.0058) |
Judicial indicator variable | - | - | - | 0.0023 (0.0035) | 0.0031 (0.0038) | 0.0060 (0.0036) |
Independent commission indicator variable | - | - | - | −0.0132* (0.0060) | −0.0138* (0.0066) | −0.0172** (0.0043) |
Other commission indicator variable | - | - | - | 0.0172 (0.0113) | 0.0194 (0.0119) | 0.0071 (0.0040) |
Number of observations | 2568 | 2344 | 1852 | 2568 | 2344 | 1852 |
Number of states | 43 | 31 | 19 | 43 | 31 | 19 |