[enraged_camel]

If someone continuously keeps getting tricked into voting against their own self-interests, with the belief that their vote will actually benefit them, then yes, they absolutely deserve contempt.

As the saying goes: "Fool me once, shame on you. Fool me twice, shame on me." A large part of the American populace has been getting fooled repeatedly for decades.

[mindcrime]

If someone continuously keeps getting tricked into voting against their own self-interests

It has not been established that they are voting against their own self-interests. You are just assuming you know what their interests are better than they do.