Absolutely. And it isn't even so much party loyalty, as it is the categorization they use to identify the party (short cut to thinking; hueristic). See Republican, think Conservative. See Democrat, think Liberal. For some conservation = bad and for some liberal = bad. Therefore, they discount a political position or policy based on that heuristic. E.G Repub = conservative = bad = I am against it. Very dangerous way to make political decisions. Generally, you are not even certain whether what you are voting against actually is in agreement with your goals.
