You can apply for a position with the Obama administration online – www.change.gov.
This website is designed to provide prospective applicants with information to help them apply for positions in the Obama-Biden Administration.
From the website:
Application Process:
1. Please complete and submit the on-line Expression of Interest Form below.
2. Within a few days, you will receive an email with a link to a more complete on-line application.
3. Upon submitting your full on-line application you will receive an e-mail acknowledgment.
4. If and when you are considered for a specific position, you will be asked to fill out additional forms, including financial disclosures, and be subject to other reviews which may include FBI background checks.