I think you are confusing the ICRC (Illinois Center Right Coalition) with the SCC (Republican State Central Committee). The ICRC is not affliated with the SCC and is officially non-partisan. The ICRC certainly did NOT support Topinka in the primary, or in the general election. I know, I'm on the board of ICRC and helped draft the resolution against her.
The SCC was officially neutral in the 14th CD primary. However, most of the Illinois GOP "establishment" on the federal level, including Hastert, endorsed Oberweis.