For some reason I've never understood consequentialist philosophers also often/usually collapse that cardinal ranking into the right (usualy one) action and all the other wrong actions, see this. Presumably they wouldn't worry too much about this problem.
This was demonstrated, in a certain limited way, in Peterson (2009). See also Lowry & Peterson (2011).
The Peterson result provides an "asymmetry argument" in favor of consequentialism:
Another argument in favor of consequentialism has to do with the causes of different types of moral judgments: see Are Deontological Moral Judgments Rationalizations?
Update: see Carl's criticism.