How to publish file using logon user from within elevated code

Hi,

The following piece of code is exceuted with elvated priliveliges.

void Test(SPListItem item)
{
   SPSecurity.RunWithElevatedPrivileges(delegate()
   {
 // Perform few operations on the item.
 SPFile listfile = item.File;
 listfile.Publish("comments");
   });
}

The published version has modified by as system account.
Is there any option to publish the file using logon user from within elevated code?

Thanks in advance,
dhijit