Sen. Elizabeth Warren, D-Mass., said Wednesday that she won't run for president in 2016 and intends to serve out her full six-year term as senator.

"I'm not running for president and I plan to serve out my term," Warren said, according to a Boston Herald report Tuesday.

"I pledge to serve out my term," she later added, when pressed about the issue.

Warren, a first-term senator from Massachusetts, has stoked speculation about a potential president bid in recent months as progressives have lauded her populist tone. Warren's statement today may take her out of the running for now, but if we've learned anything from political ambition, it's that some promises are made to be broken.

Case in point: In 2006, then-Sen. Barack Obama, D-Ill., said he planned to serve out his full term in the Senate, but he ultimately decided to run for president.