Yep, if we use France, Netherlands, UK, as our examples; Muslim critical mass is around 10% of given population. Whether it's national, state, local, once this is achieved there is enough political representation and thereby clout to be the swing vote to affect most legislation. Currently the U.S. has a Muslim population of about 3% I believe. However, it's growing rapidly and will at the magic 10% very soon if we don't change our immigration policy asap...
The Koran tells them that they only have to be 10% the size of their enemy to defeat it.