What would happen if a major disaster hit America, millions died, air traffic ground to a halt, electricity was down and Congress needed to act? And what if half the members of Congress were among the dead or missing? These aren't pitches for a disaster movie set in Washington. These were all serious scenarios floated by members of Congress tasked with coming up with ways to bring Congress into the modern world--a world where cyber threats, pandemics, nuclear war and political violence are all well within the scope of possibility. "This isn't just hypothetical anymore," said Rep. Ed Perlmutter, D-Colo.,...