Error installing Clustering with SQL Server 2012 on Windows Server 2012
Install with the pre-SP1 SQL 2012 media.  Then, after your cluster is up, follow the procedure to apply SP1.  It appears the 11/2012 SP1 slipstream installer was not tested for this component when being installed from scratch.  

This media worked:  en_sql_server_2012_enterprise_edition_x86_x64_dvd_813294.iso

This did not: SQLServer2012SP1-FullSlipstream-ENU-x64.iso