something to consider...
after 4 years of undergrad, you might not get into law school or you might decide that you do not want to be a lawyer.
in picking a major, choose one that 1) will prepare you for law school and 2) will help you find a job in an area you want should you decide not to go to law school.
also, if you're interested in a particular area of law, you might need a specific undergrad degree (i.e. accounting or finance for tax law or some sort of science for medical malpractice, etc)