This, from Blue Street Journal:

Social Psychologist Geoffrey Cohen found that Democrats will typically support a policy proposal that severely restricts entitlements (something typically favored by Republicans) if they think it was proposed by members of their own party. Additionally, Republicans will typically support an extremely generous entitlement program if they think it was proposed by Republicans. In contrast, if a Democrat or Republican thinks that a policy was proposed by the opposing party, they will tend to reject it no matter what it says. This was tested in a lab study where participants were asked to read the policies for themselves. Democrats were led to believe that the policy they were reading was proposed by a Democrat, even though it was actually proposed by a Republican. Republicans were placed in the same scenario, but with a Democratic policy they believed was proposed by a Republican. In both situations, the participants tended to agree with the policy they believed was affiliated with their own party and rejected the policy they believed was affiliated with the opposing party. A second group of Democrats and Republicans rejected the very same ideas that the first groups accepted when they believed that they were proposed by members of the opposing party. This demonstrates that people tend to accept political ideas based on party affiliation rather than the actual content of the ideas.