 In an April 30, 2007 Rasmussen Reports Poll, Barack Obama led the poll for the Democratic nomination for first time with 32 percent support.By June however, Clinton was winning all the major national polls by double digits except one that showed Obama with a one-point lead, and by July, all major national polls showed Obama trailing Clinton by double digits.Polling analysts are expected to take note of whether opinion polling statistics regarding Obama prove to be accurate, or are ultimately subject to the so-called "Bradley effect" observed in some previous American elections.