Sarah Palin vs. Bill Clinton: Whose endorsement means more?

Sarah Palin had a good night Tuesday, with three of the four candidates she had endorsed – including California’s Carly Fiorina and South Carolina’s Nikki Haley – either winning their primaries or making a runoff. But the effectiveness of such endorsements is up for debate. The endorsement game is in full swing, and politicians are happy to receive credit when someone they publicly back goes on to win – especially if that person can be useful, say, in a future presidential campaign. Former Alaska Governor Palin’s late endorsement of Terry Branstad for governor of Iowa puts her in his good...