National Policy, the Presidency and State Governors

Virginia's former Governor Mark Warner won't be challenging Senator Hillary Rodham Clinton for the Democratic presidential nomination. Now other governors will be running harder than ever. Despite all the attention given to US senators, governors' mansions have become the "training grounds of future presidents." Four of the last five presidents started out as governors of their states, and even when they aren't planning to run nationwide, governors can have a major impact on national policy.  Democrats are poised to take a majority of governorships this year for the first time since 1994. We look at some key states and find out why governors matter even if they're not running for president.