WASHINGTON --A visibly infuriated President Barack Obama surrounded himself with tear-stained parents of Connecticut school shooting victims Wednesday after the Senate voted down a measure designed to keep guns out of the hands of criminals and declared it a "pretty shameful day for Washington." He said a minority of senators decided "it wasn't worth it" to protect the nation's children. The Senate, which is controlled by the president's own party, handed him a stinging first defeat for his second term by voting down a bipartisan compromise to expand background checks for gun buyers.