EPA Administrator Lisa Jackson resigns over apparent content of emails written under pseudonym

Apparently, EPA Administrator Lisa Jackson as well as the Obama administration has not admitted that the reason for her leaving the administration has anything to do with the emails that she sent out using a pseudonym.  What may have caused her concern is not the fact that she sent out these emails using a pseudonym but apparently the content of the emails.  Obama praised Jackson, but did not criticize her in anyway for her email activity.  Her use of these emails would at least seem to break Obama's promise of transparency, and that promise appears to have been further broken by Obama not admitting that the emails served as the reason for her leaving.  From Fox News:

A Washington attorney suing the Obama administration for access to alias emails sent by EPA Administrator Lisa Jackson claims that a recent decision by the Justice Department to release thousands of those emails next month contributed to her resigning Thursday.
Jackson, in a brief written statement, said Thursday she is leaving the EPA after four years on the job, for "new challenges, time with my family and new opportunities to make a difference."
The agency did not offer an explanation. But Chris Horner, a senior fellow at the Competitive Enterprise Institute, said the scrutiny over the alias emails is clearly a factor.
"Life's full of coincidences, but this is too many," he told FoxNews.com. "She had no choice."
Horner and CEI earlier this year had sued the EPA for documents pertaining to Jackson's use of alias email accounts. She was said to operate under the name "Richard Windsor" -- the use of those accounts has since drawn the scrutiny of Republican members of Congress, as well as triggered an audit by the EPA inspector general. . . .