Just days after expanding her paid media effort into Oregon, Hillary Rodham Clinton is on the air in West Virginia with a slightly tweaked version of a populist economic spot (subscription) that first aired in South Carolina. In "Falling Through," Clinton speaks to voters' sense of economic anxiety, comparing the Bush economy to a trapdoor and promising "to be a president who stands up for all of you."

"Falling Through" joins advertising from Barack Obama already on air in West Virginia, where Democratic voters will head to the polls on May 13. What limited statewide polling is available shows signs that Clinton already enjoys a sizable lead in the Mountain State, but given the proportional allotment of delegates under Democratic Party rules -- not to mention the volatility of the race so far -- it's been in both candidates' interests to invest even in states they could be assumed to safely carry.