Many Midterm Toss-up Races In Urban Districts so by Black Surge for Trump Republicans Retain House?

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People assume that Congressional districts where the majorities voted for Hillary over Trump in 2016 will automatically vote for the Democrat candidates in these midterms, but considering Rasmussen polling says the black approval of Trump and his agenda has risen to 40%, polling models for these midterm elections in the urban areas may well be greatly flawed.