I think Rhyme posted on this topic as well. Just think of it this way. Everyones objective is going to be "To get into school X MBA program for the purpose of using it in the future for Y" You have limited space on your resume and you should be using it to highlight your qualifications.
The first lines of your resume are the most important and your readers attention will slowly drift away as they move down the page.
Definitely include your internships if they are applicable. Depending on how far back they are, the details of what you did become less important. (ie. does Berkeley really care you made copies at a law firm for a summer)
Make sure your resume concentrates on the points applicable to the MBA (leadership, problem solving, innovation, initiative to name a few). I have a software background and submitted my resume without a single technical word. (c++, xml, html etc..)
Business resumes on a whole are moving away from objectives. I have a PDF of 355 Wharton student resumes. No one includes an objective.