That August was a watershed in American history. Throughout the first half of the twentieth century, the “party of Lincoln” was identified by the public as the party more favorable to the aspirations of Negroes. The Democrats’ situation was complicated: they simultaneously began winning the allegiance of black voters by dint of the New Deal and relied on Southern segregationists for their majorities. But by the early 1960s, with Goldwater conservatives in the ascendancy among Republicans, and Northern liberals in the ascendancy within the Democratic coalition, a crossover point had been
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