(...) Reliable GOP Source: Hey, you can’t print this, but we just had a poll come back saying that [House Democrat who everybody figured was pretty safe] is down 20.
Me: Well, that’s swell. But why can’t I use this?
Reliable GOP Source: We don’t think the Democrats know this guy is this much trouble, so we don’t want to tip them off.
Me: Well, thank you for sharing really cool information that I cannot share with readers.
Reliable GOP Source: I thought it might be helpful with you determining which challengers to watch. While it would be great to have you break this news, I think it’s more useful to us to keep the Democrats in the dark. (...)