People gravitate toward information that implies a happier outlook for them.
Every four years in the presidential election, some new precedent is broken.
You don't want to influence the same system you are trying to forecast.
If there's a major foreign policy event, the President gets on TV, the Congress doesn't.
The thing that people associate with expertise, authoritativeness, kind of with a capital 'A,' don't correlate very well with who's actually good at making predictions.
We speak for them. We imbue them with meaning.