Main Point Questions

For some obscure reason, on the LSAT reading comprehension questions I can answer almost any question about the passage except, "What is the author's main point?" This is truly embarrassing but perhaps by acknowledging it publicly I will force myself to be able to distinguish purpose from relevance.

In recognition of other's ability to do so I would like to quote Marc Ambinder's compendium of Barack's speech tonight...

Who he is. Why McCain is bad. We need to come together.

I do not posses a talent for pithiness. But I respect it whole-heatedly!