What is the test for requesting an attorney to represent a plaintiff in a personal injury action?

"court may request an attorney to represent any person unable to afford counsel." However, counsel should only be appointed in "exceptional circumstances." Terrell v. Brewer, 935 F.2d 1015, 1017 (9th Cir. 1991). A district court should consider both the likelihood of success on the merits and the ability of the plaintiff to articulate her claims pro se in light of the complexity of the legal issues involved, but "[n]either of these factors is dispositive and both must be viewed together before reaching a decision." Id.