Recent inspections did show "concerns about stress and fatigue" in aspects of the bridge but did not result in calls for immediate restrictions on the bridge, Minnesota Gov. Tim Pawlenty said Thursday.

CNN: Experts: Leadership, money keys to building bridges

"I can't stress strongly enough the importance of conforming to road closures and the bridge closed signs out there, " said Mr Spittle.

BBC: Bridge at Tadcaster over the River Wharfe

Their problems range from unemployment to difficulty getting pregnant, possible alcoholism, sex addiction, and post-traumatic-stress disorder stemming from the 2007 collapse of the I-35W bridge into the Mississippi River during an evening rush hour.

WSJ: Review: Moore's 'Collapse' is a trenchant comedy

Today, daily tracking polls let campaign managers detect early signs of stress and fine-tune their candidates' support mechanisms, like engineers monitoring a shaky suspension bridge.

FORBES: Elections Old And New