This is one of the weirder tales over there (and that's saying a lot). The fact that the call came from Reno probably means that whoever reads the emails that the White House receives forwarded it to some DNC volunteer who called for no other reason than to keep her a solid Democrat voter. As horrible as it is to envision losing a child, there's no way that some complete stranger can call and provide any meaningful input into such a terrible loss. As others have said, most of us would turn to family, friends, counselors or clergy. DUmmies fall back on politicians and politicians respond because they want that vote.
