Foriegn entities lobby heavily in the US as well. The Sunday Telegraph reports on recent spending by British companies. See article here:
Successful British companies in America appear to regard lobbying as a routine expense in their US operations. One executive at a company operating in the lobbying market said: “You simply have to put your money to work in that way at times. If we opted not to lobby, legislation would not be promoted.”
The Best Government Money Can Buy? is a non partisan documentary that looks at the relationship between lobbying and campaign finance.