| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 |
State normalized presidential vote (SNPV) | 0.3609** (0.0927) | 0.3491** (0.0984) | 0.4058** (0.1098) | 0.3651** (0.0949) | 0.3536** (0.1009) | 0.4130** (0.1126) |
Preclearance indicator variable | 0.0161** (0.0054) | 0.0186** (0.0057) | 0.0169* (0.0066) | 0.0154* (0.0067) | 0.0182** (0.0066) | 0.0183* (0.0073) |
Bipartisan legislative indicator variable | - | - | - | −0.0090 (0.0056) | −0.0091 (0.0062) | −0.0060 (0.0092) |
Judicial indicator variable | - | - | - | −0.0058 (0.0037) | −0.0050 (0.0039) | −0.0056 (0.0054) |
Independent commission indicator variable | - | - | - | −0.0165** (0.0040) | −0.0171** (0.0045) | −0.0213** (0.0055) |
Other commission indicator variable | - | - | - | 0.0073 (0.0070) | 0.0086 (0.0074) | 0.0042 (0.0043) |
Number of observations | 1712 | 1552 | 1222 | 1712 | 1552 | 1222 |
Number of states | 43 | 30 | 18 | 43 | 30 | 18 |