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If Obama is tough enough to go againts the GOP here is his first test. Clinton's attacks are all fair game in an election (assuming her staffers didn't release the photo, if they did than that crosses a very big line) because it is more than fair to contrast her experience with Obama's inexperience.
Now we will get to see if Obama can pass this test as he has passed previous ones. How he handles these criticisms will tell a lot about his campaigns ability to hit back.