Guess who won't be paying attention to this thread.
Internal polls are obviously inferior to regular polls, but they aren't completely worthless. Releasing internals showing yourself tied or trailing is tantamount to admitting that you will lose, though there are uncommon cases where they do it on purpose to get money from the national party for races that are not yet on the radar.
Point is, internals do contribute to developing one's picture of a particular race, though not in the same sense that regular polls do.
I know, it's just that it is really annoying to see people overreact to internals. It's obvious when a polls reflects what a certain candidate wants for fundraising. A good example is the internal showing Driehaus two points behind Chabot. All credible polls show Driehaus behind by at least 10 points. Chabot needed for the race to be thought of as tossup in order to get funding from the party and from individual donors. There is nothing credible about the poll, yet red avys got all excited. This applies to Republicans too.