It recently came out that Hillary Clinton had posted on her email server the names of intelligence officials who were working undercover. This is indeed very similar to the Valerie Plame scandal that happened under President Bush. Valerie Plame's name and status as a CIA operative were released by a Washington Post reporter working from information obtained from the State Department. In both cases, extremely sensitive information was compromised.
It is similar to the Valerie Plume scandal because it involves the potential to out or name an undercover CIA source or asset. Those who are involved in the Central Intelligence Agency weather as a member or asset risk their lives each and every day and rules are in place to protect them.
Hillary Clinton's e-mail contained names of hidden intelligence officials, but this is not reminiscent of the Valerie Plume scandal. In the latter case, her name was intentionally released, apparently for political reasons. In the case of Hillary Clinton, there was no intent. She mistakenly used a private e-mail account, believing it to be secure.
Hillary's email scandal, as reprehensible as it is, is NOT "reminiscent of the Valerie Plame scandal". Dick Cheney outed Ms. Plame in a fit of vulgar revenge against her husband, Joe Wilson, for busting the Bush administration on its bogus "Niger yellowcake uranium" pretext for invading Iraq. It was done out of pure spite, with the most malicious intent. By contrast, there's every evidence that Hillary did what she did out of gross negligence, carelessness, and recklessness. This doesn't in any way excuse Hillary's actions. But the difference in motivation makes them very different from what Dick Cheney did.