See clip from Attorney Rajiv S. Khanna's conference call video that addresses this question.
214(b) denials, typically you will come across in student visa applications, tourist visa applications, even J-1/J-2 applications. They can be problematic because they are very difficult to overturn. It is a matter of subjective determination of the consulate that they suspect the applicant has an immigration intention.
If somebody has come to the US on a tourist visa or any other nonimmigrant visa and gone back within the time permitted that’s a good sign. That shows that you are somebody that you can be trusted. In a case like yours unless there was a reason for the consulate not to trust your submission they should have considered your case more sympathetically than the case of somebody who has never been to the United States.
I don’t think the sponsorship is a problem.