Work flow or logic hook? I want to automate the 'Send Mail at Scheduled Time' button action

Inside the Campaign wizard, you are required to click on the ‘Send Mail at Scheduled Time’ in order for the campaign to send the email marketing to the target lists defined in the Campaign. Does anyone know of a way to automate this process through workflows or logic hooks? Basically I don’t want to be required to click that button for Email Marketing items to be sent. I want them to automatically use the start date on the email marketing item, instead of waiting for the click of the button to add them to the email queue. Would really appreciate some assistance with this issue, thanks in advance for your time.