imple fact remains that "there is no constitutional right to plea bargain." Weatherford v. Bursey, 429 U.S. 545, 561 (1977); accord United States v. Barrentine, 591 F.2d 1069, 1078 (5h Cir. 1979). To be sure, the courts tolerate plea bargaining because it helps reduce the workload of congested criminal doc