While Massachusetts Democratic Sen. Elizabeth Warren said she hopes former Secretary of State Hillary Clinton makes a run for the White House in 2016, she declined to explicitly endorse Clinton's candidacy today on "This Week."

"You know, all of the women - Democratic women, I should say, of the Senate - urged Hillary Clinton to run, and I hope she does," Warren responded when asked by ABC's George Stephanopoulos if Clinton was her candidate in 2016.

"Hillary is terrific," she said when asked again if she would endorse her in the event Clinton makes a run for the Democratic nomination.

Stephanopoulos also asked Warren about her past as a registered Republican in the 1990s and why she left the party.

"I was originally an independent. I was with the GOP for a while because I really thought that it was a party that was principled in its conservative approach to economics and to markets and I feel like the GOP party just left that," Warren said.

"They moved to a party that said, 'No, it's not about a level-playing field, it's now about a field that has gotten tilted,' and they really stood up for the big financial institutions when the big financial institutions are just hammering middle class American families. You know, I just feel like that's a party that moved way, way away," Warren said.

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