Ta-Nehisi Coates points out that support for mass incarceration existed on both sides of the isle.
In Texas, the Democratic governor, Ann Richards, had come to power in 1991 advocating rehabilitation, but she ended up following the national trend, curtailing the latitude of judges and the parole board in favor of fixed sentencing, which gave power to prosecutors. In 1993, Texas rejected a bid to infuse its schools with $750 million—but approved $1 billion to build more prisons. By the end of her term, Richards had presided over “one of the biggest public works projects in Texas history,” according to Robert Perkinson’s Texas Tough: The Rise of America’s Prison Empire. In New York, another liberal governor, Mario Cuomo, found himself facing an exploding prison population. After voters rejected funding for more prisons, Cuomo pulled the money from the Urban Development Corporation, an agency that was supposed to build public housing for the poor. It did—in prison. Under the avowedly liberal Cuomo, New York added more prison beds than under all his predecessors combined. [link]