I'm glad Holder and company are fighting these congressional maps. It's as important as fighting for voting rights.
In Florida, within a month after I'd made myself and husband counted by the online deadline, four census workers showed up at our house to count us again. I took photos of their badge ID's, showed them a screen shot of my being counted and told each to notify their zealous supervisors that they'd better not overcount us or I'd report them to the FBI and DHS.
NPR report of the Urban Institute's projection of undercounts for
-- Black people by 3.68%, or 1.7 million
-- LatinX by 3.57%, or 2.2 million
-- children under age 5 by 6.31%, or 1.3 million
... these projections are based upon what the Urban Institute considers a "high-risk" scenario. Still, John Thompson, a former Census Bureau director who reviewed the report, says that these estimates "may be a little bit on the conservative side."
At the state level, these trends mean that states with more historically undercounted groups including people of color and renters are more likely to have inaccurate population counts in 2020. While California, Texas and Nevada face high undercount risks, states with older populations that are more likely to be white and owning homes including Maine, New Hampshire, Vermont and West Virginia have the greatest potential for being overcounted, according to the institute's analysis. In the 2010 census, for example, white homeowners were overcounted because some with multiple homes were counted incorrectly at multiple addresses.
https://www.npr.org/2019/06/04/728034176/2020-census-could-lead-to-worst-undercount-of-black-latinx-people-in-30-years