David Cameron Visits Teenage Cancer Trust Unit

LONDON, UNITED KINGDOM - APRIL 5: Conservative Party leader David Cameron talks to nurses in the Teenage Cancer trust unit at University college hospital on April 5, 2010 in London, United Kingdom. A succession of weekend polls show that Mr Cameron is back on course after weeks of buffeting in which his lead in the polls has taken a dramatic fall. (Photo by Richard Pohle - WPA Pool/Getty Images)