Yes. To create a new follow-up, go to http://muckrack.com/pitches and select an existing Pitch. When viewing your pitch, select recipients to include in your follow-up and click Send follow-up.
Each follow-up will include the text (even if personalized) of your previously sent pitch, and it will appear in the recipient’s email inbox like any other follow-up.
Sending a follow-up will count towards your organization’s email limits.