Good piece of detecting Susan Dowell!
Samuel HINCKLEY was born May 23, 1589 in Harrietsham, Kent, England. Married May 7, 1617 in Hawkhurst, Kent, England Sarah SOOLE/SOULE. His descendants include the 6th and final Governor of Plymouth Colony and 3 of our last 4 US Presidents--the 2 Presidents BUSH and President OBAMA.
You can view this connection at the Press Release section of the New England Historic Genealogical Society website.