EVERGLADES, FL - MAY 28:  United States Senator Bill Nelson (D-FL) (L-R), Thomas Strickland, United States Interior Assistant Secretary for Fish and Wildlife and Parks, Ron Bergeron, Florida Governor Charlie Crist and United States Secretary of the Interior Ken Salazar stand as a Fish and Wildlife official helps get the airboat dislodged after it became hungup during a tour of the Florida Everglades on an airboat on May 28, 2009 in the Everglades, Florida. Salazar visited the Everglades to get a first hand look at the park and get a briefing on invasive species. Getty Images logo Getty Images 5 months ago

EVERGLADES, FL - MAY 28: United States Senator Bill Nelson (D-FL) (L-R), Thomas Strickland, United States Interior Assistant Secretary for Fish and Wildlife and Parks, Ron Bergeron, Florida Governor Charlie Crist and United States Secretary of the Interior Ken Salazar stand as a Fish and Wildlife official helps get the airboat dislodged after it became hungup during a tour of the Florida Everglades on an airboat on May 28, 2009 in the Everglades, Florida. Salazar visited the Everglades to get a first hand look at the park and get a briefing on invasive species.