Bull. There's no evidence to support this theory. Zero, zilch, nada.
The only thing the article you linked had to support the theory was the fact that mama Obama showed up in Seattle within a month of the birth. If Seattle were in BC, then maybe he'd have a point, but last time I checked, Seattle is part of the go 'ol USofA.
Stanley Ann Dunham had an Aunt (Dad’s Sister)
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=34618044
who lived in Blaine Washington.
http://radaris.com/p/Eleanor/Berkebile/ (Look up Eleanor B. Berkebile)
Funny thing is, Blaine is a twin city with White Rock, Surrey, British Columbia. (Check it out with google maps.)
Blaine Washington did not have a Hospital in 1961.
If someone was a young pregnant girl living in Blaine Washington in 1961, They would have had to go to Peace Arch Hospital in White Rock British Columbia to have their baby.
( I had a link for that too, but the “Province” newspaper keeps pulling that link.)
Of course in 1961 a young teenager pregnant with a bi-racial child would NEVER get sent to live with her Aunt.