The incredibly random list of celebrities endorsing Bernie Sanders

They can sell shampoo and raise funds for disaster relief, but when it comes to politics, no one knows for sure whether celebrity endorsements matter.Researchers haven't reached a concrete conclusion. One study discovered Oprah's endorsement of Barack Obama in 2008 significantly increased the chances that her magazine subscribers would vote for him. Another study found that college students were not influenced by household names' choices -- but instead sometimes thought less of the celebrities a...