The reason why there were so many Democratic members of Congress in the 1960s was because of the Dixiecrats the Southern Caucus in Congress who were famous for blocking civil rights legislation in the Senate and the African-Americans who could vote back then, were voting for more liberal or progressive Democrats and Republicans. Yes Republicans were competitive back then with African-Americans as well as in the Northeast. Because they weren’t controlled by the Religious-Right, or people who I today call Neo-Confederates. Who are still fighting the Civil War let alone the Culture War who back then were blocking civil rights legislation in Congress. Today are pushing these so-called Voter ID laws bills that are a solution in search of a problem. But are actually designed to prevent traditional Democrats like African-Americans, Latinos, young people from voting in swing states. So Republicans can stay in power there.