Depending on which presidential campaign poll you look at, President Obama either has a 9 point lead nationally over Mitt Romney, a 7 point lead, a 4 point lead, a 1 point lead, or its tied, or Romney has a 1 point lead over the President, or a 2 point lead. Huh?

Welcome to campaign polls. It’s not quite an exact science. In fact, some would argue it is as much an art as it is a science. Consider the national polls represented in the Real Clear Politics average, which is updated daily. In the...