Two new buses built from the ground up for Midwestern tour
                                
                                
                                    (Newser) -
                                    This bus is Barackin', so don't bother knockin': President Obama is cruising the Midwest in a customized bus that is essentially a pumped-up version of his  five-ton hulking limo, dubbed "the Beast."  The bus, one of two ordered up by the Secret Service, sports bulletproof black windows,...