I wouldn't recommend that. Typically, I rewrite about 40% of the content of any given article before submitting it to other places. Interesting article on Search Engine Roundtable: http://bit.ly/a0vbNO about writing unique content. Hope that helps! -E
Depends where you are posting it, if you care about the page you are posting the article on then you should rewrite it. If you are just spreading it to a bunch of directories then it doesn't matter. My advice is to let it index on the page you care most about then spread it around once its been on there for a week or two.