1Heat gas or charcoal grill. In blender, place tomato sauce, salsa, brown sugar, vinegar and chili powder. Cover; process until smooth. Pour about half of the sauce into small bowl for basting. Pour remaining sauce into another small bowl; set aside for serving.
2Sprinkle chicken legs with salt and pepper. Place chicken on grill over medium heat. Cover grill; cook 16 to 20 minutes, turning once, until juice of chicken is clear when thickest part is cut to bone (at least 165°F). Brush chicken legs generously with sauce, turning to coat evenly. Cover grill; cook 1 to 2 minutes longer on each side.
3Serve chicken with reserved sauce for dipping.