We tend to believe - and politicians often claim - that if someone is being criticised from both sides, they are likely to have found some reasonable middle ground. My uncle just offered that opinion about Obama, because some Democrats are mad at him. But it is the sort of thing that could have been said about any politician, that they would regard as a badge of honor.
But you can have the impression that you're getting it from both sides wherever you stand. It doesn't have to be fifty-fifty. You can have 90% of the people pissed at you from one side and 10% from the other, and still tell yourself you're in the golden middle.