Even though the field State of Portfolio Item has been defined correctly in CA Agile Central Add-in Excel, importing it won't populate the State field in Rally and will leave it blank.
The current version (2.4.4) of the CA Agile Central Excel Add-in does not support importing field State of Portfolio Items.
The Beta Version of the Excel Add-in does support this or you can use the User Interface of Rally to import all of your Portfolio Items including their states.