One progressive activist groups seems deeply concerned that young Americans do not completely understand the “fierce urgency” of Obamacare.

President Obama’s landmark healthcare achievement will crumble if young people opt-out, liberal advocacy group, acknowledged in an email to its donor base on Thursday afternoon.

“The problem is… if younger, healthier people don’t participate, then costs will skyrocket and Obamacare will fail,” reads the “urgent” communication the group sent to its donors.

The email then accuses conservative groups of seeking to torpedo The Affordable Care Act by exploiting this weakness.

“These groups are so blinded by hate for Barack Obama that they’ll do anything to make his signature program go up in smoke,” reads the email. “[T]heir plan: Mislead young people about how the law works so they get scared and don’t enroll.”