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WASHINGTON — Days after introducing her Green New Deal — a plan to combat climate change that has won the endorsement of several Democratic presidential candidates — Representative Alexandria Ocasio-Cortez found the proposal enmeshed in confusion when her staff published a summary that included provisions not endorsed by the candidates.

Over the weekend her staff backed away from the document, saying it was incomplete and had been published by accident, after Republicans pounced on the plan, citing a blog post of frequently asked questions. That post included language that called for economic security “for all who are unable or unwilling to work.”

“An early draft of a FAQ that was clearly unfinished and that doesn’t represent the GND resolution got published to the website by mistake,” Saikat Chakrabarti, Ms. Ocasio-Cortez’s chief of staff, wrote on Twitter, referring to the plan by its acronym.

The plan, written by Ms. Ocasio-Cortez, a freshman Democrat from New York, and Senator Edward J. Markey of Massachusetts, was modeled on Franklin D. Roosevelt’s New Deal and embraced by several presidential candidates, including Senators Kamala Harris, Democrat of California; Kirsten Gillibrand, Democrat of New York; and Cory Booker, Democrat of New Jersey. It was also welcomed by Senator Bernie Sanders, independent of Vermont, who is seen as a possible presidential contender.