RALEIGH, N.C. -

A House Democrat says she voted mistakenly to override Gov. Beverly Perdue's veto of a bill that authorizes fracking in North Carolina but was told she couldn't change it because the outcome would have changed.

Rep. Becky Carney of Charlotte says she pushed the green button at her desk Monday night to vote to override the vote before realizing she wanted to vote red, or "no."

Her "yes" vote made the tally 72-47 - just above the 60 percent majority required for the override. Changing her vote would have reduced the majority below 60 percent.

The chamber's operating rules prevent members from changing a vote if it affects the result.

Carney had voted earlier against fracking. She said she feels terrible about her error but acknowledged the bill passed legally.