Elizabeth Warren addresses the Democratic National Convention in Charlotte, N.C., on Wednesday, Sept. 5, 2012. (J. Scott Applewhite - AP)

Sen. Elizabeth Warren (D-Mass.), in a new interview, reiterates twice that she's not running for president.

Warren's soon-to-be-released book has once again stirred conversation that she could enter the 2016 race as the standard-bearer of the Democratic Party's liberal base. But she has said before and says again -- twice -- that it's not in her plans.

“I am not running for president,” Warren told "CBS Sunday Morning," according to an advance transcript. “You can ask lots of different ways, but I wrote this book because I can’t wait any longer. It’s written out of gratitude for my start and the opportunities that America built for me, and how I think that’s what we’ve got to do again.”

Warren has repeatedly used that construct -- "not running for president" -- and some would note that it's not quite the same thing as saying definitively that she won't run in the future. But she has also said that she would pledge to serve out her term (after some pressing), which ends in 2018.

The full interview airs Sunday at 9 a.m. Eastern time.