Richard Carmona officially has a free ride in the Democratic primary. This was e-mailed from David Ruben yesterday:
Unfortunately, after a review of our signatures, we found that we may not have had enough to continue running for the US Senate. We have withdrawn from the campaign. We want to thank all of you for your support and the opportunity to work and learn from you about the issues that affect us all. We will look forward to opportunities in the future to interacting with you again.
Best Regards David A. Ruben MD MBA