2) The point of the Siljander/Upton comment was that the NRCC funded a primary challenge by Upton against a seated Republican congressman, Siljander. This is one reason why I would never give money to the NRCC.
I still find that HIGHLY unlikely. The only time LEGISLATIVE cacuses do this is when it's a sure thing (because of some foolish thing done in office) that in the incumbent is going to lose in the fall's general election. And that is certainly a subjective call. And even the Democrat's House campaign operation didnt go that far against Gary Condit and he was as close to a sure loser as you can get.