As there are sites with Australoid bones in Brazil that predate the 15,000 year entry date by about 20,000 years, and there's mt DNA in native americans that could ONLY have come from Europe about 20,000 years ago or more, it's never been seen in Asia. They've even found Ainu DNA in natives from DNA studies of the immune system.
So why this fixation with Clovis Asians as the sole ancestors of native Americans?
http://mathildasanthropologyblog.wordpress.com/2008/03/08/could-mitochondrial-dna-type-x-have-made-it-to-the-us-via-the-sea/
http://mathildasanthropologyblog.wordpress.com/2008/03/10/the-oldest-human-site-known-in-the-americas/
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