I've got two, and they're both indexed and ranking, since I put them up at the beginning of the month. But I'm using only my own content, and none of WhyPark's at the moment - and that's probably why.
When you think about duplicate content, it's important to think of it in terms of percentages, because I'm fairly sure that's how Google figures it (they have to do it by algorithm, because anything else wouldn't scale)
So it stands to reason that if Google comes along and sees that a significant percentage of your site is duplicated either elsewhere on your own site, or elsewhere on the web, then you run the risk of having them decide it's not important enough to index and/or rank. It's a balancing act.
A certain percentage is always going to be duplicate across all your pages - your navigation, headers, footers, etc. If you're using WhyPark (or other syndicated) content, then you have to add that to the percentage.
By the time you add all that up, if it's over 60 to 70% duplicate, well, you're probably going to have a problem.
So what you have to do is figure out how you can add some unique content to tip that percentage back a little bit in your favor. Having unique page titles and meta description tags helps, but sometimes you need a little more. Sometimes you can do it with a paragraph (if you have a small amount of duplication elsewhere) or sometimes you have to do it with a LOT of paragraphs. It all depends on keeping your percentages in balance.
If you think you are running into a duplicate content issue in Google, then start by making sure all your titles and meta description tags are unique to the page. Then start adding content, a paragraph at a time, and see if that doesn't improve it. But if you just add more syndicated content, you're just going to exacerbate your original problem.
And if you're stumped about adding fresh unique content, then try it the other way - try REMOVING some of the duplicate content, to even it out that way. Choose fewer syndicated articles per page, for example.
You'll probably have to keep tweaking until you get a formula that works for you and your niche.
Remember - if it were easy, everyone on the planet would be publishing.