Court of Appeals for the First Circuit November 2, 1987, 87-1302 (Medical Malpractice Joint Underwriting Association of Rhode Island v. Mark A. Pfeiffer, Etc.)

TORRUELLA, Circuit Judge.

The only issue presented on appeal is whether the district court erred by abstaining from adjudicating a challenge to the constitutionality of a state statute on the basis of principles announced in

Colorado River Water Conservation District v. United States,

424 U.S. 800, 96 S.Ct. 1236, 47 L.Ed.2d 483 (1976), and by this court in

Allstate Ins. Co. v. Sabbagh,

603 F.