For those americans who are properly informed and up to date on facts you could understand why VP Biden just had to laugh while listening to the astounding amount of lies Ryan told during the debate. Ryan's level of dishonesty has many americans very concerned about his knowledge, expertise and integrity required for being a VP. When you can run on your own merit or have nothing to hide, this inexcusable amount of lies would not be necessary. Biden's obvious expertise and knowledge made Ryan look like a young, inexperienced seasoned liar.
Current TV stated it best when they said "If Joe Biden was smiling - Ryan was lying." Biden proved this by nipping every Ryan lie in the bud after every smile. One of the most startling lies was when Ryan attacked the stimulus and how it made the economy worst. Biden immediately reminded Ryan that he sent letters to the Obama administration asking (begging) for stimulus money and also stating how the stimulus was good and would create jobs. In spite of what the Romney/Ryan campaign says, FACTS DO MATTER.
GO JOE - Obama/Biden 2012 without question.