Trailing in pledged delegates and with the popular vote in doubt, the Clinton campaign has apparently come up with another metric to convince superdelegates that there is a justification for going against the tide: Primary delegates.

At the end of today’s Clinton conference call (during which Phil Singer said that if the Clinton campaign were a baseball team, they have a "great leftfielder in Mark Penn") NBC’s Chuck Todd observed that Penn seemed to be using the term "primary delegates" more often, and he asked if that was a talking point the campaign might not be looking to use when making their pitch to superdelegates.

"If we are ahead in primary delegates—we’re within 16, with a lot of primaries left to go— that’s a factor," said Penn.

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