[bert]

The 90 % number is misleading and counts only in a presidential race.

For house races, many districts are gerrymandered to capture the majority black vote. In urban disrticts black voters predominate beyond the 90% level.

[DiogenesLamp]

The 90 % number is misleading and counts only in a presidential race.

Definitely.

For house races, many districts are gerrymandered to capture the majority black vote. In urban disrticts black voters predominate beyond the 90% level.

Hadn't considered the gerrymandered aspect. Yes, that probably has a significant impact.