Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Patently Clear Bias from the Authors

The authors of this reference book have a clear ideological bent, and it's expressed in favor of those politicians who combine cultural liberalism or libertarianism with free-market economics; thus, if a Representative or Senator leans rightward culturally or leftward economically, you can expect an editorial evaluation of him or her less favorable than the former sort, whether, it seems, deserved or not of that person.