http://www.google.com/search?hl=en&q=frank+marshall+davis+is+Obama%27s+real+father+Ann
theory is all over the net.
throughout this video tribute to Frank Marshall Davis (puke) there are images of him as a young man. I do not know how to capture an image from a video, but the resemblance is a fact:
http://www.hawaii.edu/uhwo/clear/HonoluluRecord1/Frankvideo.html