His own words:
Reactions from First Thoughts at MSNBC:
[…] This move has been widely speculated, but it’s a reversal from comments he made earlier in the campaign season that he would he accept general funds — which gives the candidates about $85 million to spend after the conventions. Assuming each of Obama’s 1.5 million-plus contributors gives him $100, that comes to $150 million (more)
From the McCain Campaign via CNN:
Sen. John McCain on Thursday accused Sen. Barack Obama of breaking a promise when the Democrat decided to forgo public financing in this fall’s campaign. […] McCain said that Obama’s move to drop out of the system “should be disturbing to all Americans” and that he may decide to opt out, too.
“Sen. Obama’s reversal on public financing is one of a number of reversals … that he has taken,” McCain said while touring flood-damaged parts of Iowa. (more)