Adding table to Table of Contents

I am using Arc 10.1. I am trying to add a table to the Table Of Contents using the following script but it doesn't show up without saving to a new map mxd document. I am using the following code:

mxd = arcpy.mapping.MapDocument('CURRENT')
df = arcpy.mapping.ListDataFrames(mxd, "layers")[0]
accidentsTable = arcpy.mapping.TableView("H:/ss/Projects/MaPP/Habitat.gdb/tablename")
arcpy.mapping.AddTableView(df, accidentsTable)

This seems to run fine but it's not showing up in the Table of Contents. I've tried using following:

arcpy.RefreshTOC()
arcpy.RefreshActiveView()

but it still doesn't show up. If I save the mxd file under a different name and reload the file using

mxd.saveACopy(r"C:\Project\Project2.mxd")

the table is in the Table of Contents, but that kind of defeats the purpose.

It seems like I'm missing something simple. Does anybody have any ideas on how I can add a newly created data table to the active data frame and have it show up in the currently open map document.
Much thanks for any help on this.