Rick Perry will say he's dropping out.

He'll say it during before tonight's debate (on CNN), say CNN sources.

He was this year's Fred Thompson — looks good from a distance, but doesn't sound right in the debates.

ADDED: "I believe that Newt is a conservative visionary who can transform our country. We have had our differences, which campaigns will inevitably have. Newt is not perfect, but who among us is?"