This claim will be true if the top Democratic fund raiser in 2007 according to OpenSecrets.org wins that parties nomination at their 2008 convention.
The idea here is to assess the chance that early fund raising is the major factor in determining who the Democratic nominee will be.
http://en.wikipedia.org/wiki/Fundraising_for_the_2008_United_States_presidential_election#Through_December_31.2C_2007
This link spells out how the Democratic money primary went a little better than Open Secrets(but is confirmed by data on Open Secrets).