Uphill climb for foreign runners in U.S.

...But beneath these top ranks, Kenyans and other runners are having a rough time getting into the United States, thanks to tough immigration laws that make it difficult for foreign nationals to enter.

http://espn.go.com/espn/otl/blog/_/name/assael_shaun/id/7818458/us-immigration-policies-make-hard-some-marathon-runners-enter-country-races-file