Sleazy debate tactic or just bad luck?

[petardier]

During the VP debate, Paul Ryan told an anecdote about a family affected by a tragic car crash. Did Ryan know that Joe Biden had lost his wife and daughter in an auto accident in 1972? His two sons were critically injured in the same accident.

Sleazy debating tactic or just bad luck?

http://www.dailykos.com/story/2012/10/12/1143456/-Paul-Ryan-Mentions-Car-Crash-Tragedy-Joe-Biden-Undeterred