She exudes a sense that she is tough enough to defend America's interests.
Speaking after Ms Harris at the fundraising event in California on Thursday, Mr Obama said she was "brilliant and she is dedicated and she is tough, and she is exactly what you'd want in anybody who is administering the law and making sure that everybody is getting a fair shake".
The impression she leaves is that she'll tough out damnation.
The reason it is so tough, she said, is because everything in those instances is stacked against the players.
In the mountain kingdom of Nepal it is particularly tough, especially if she is poor.
Born in Israel and reared in Boston, she is frightfully antipress and unabashedly tough on customers.
It was no doubt hard work (her biography is titled One Tough Mother, and she looks it), but Columbia is a very well known brand today.
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She wants some tough changes and is trying to push these reforms through a non-profit group called the Systemic Risk Council, which is backed by the Pew Charitable Trusts.
By contrast, Dawn Blanchfield's 12-year-old son, Kyle, is now bigger than she is and has taken to playing the tough guy.
There she is right there. (Applause.) Betsy is in a tough district.
When I have tough career decisions, I know she is someone who will ask me the difficult questions and help me come to conclusion through analysis.
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Whitman is a tough foe for any Democrat because she has cut taxes and benefits from a generally good economy.
Jo is so tough, in fact, that when she does cry, we can hardly watch.
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The market for freelance writers is tough, particularly with many newspapers struggling, she said.
The woman that emerges from these pages is cultured, sensitive and vulnerable, even as she acts tough.
Now, even though she is in private practice, other public defenders seek her help on the tough cases.
"It's a tough match, there is no question about it, " she said ahead of the Williams clash.
Even if Hillary Clinton pulls out of the race, there is going to be another tough lady taking a few hits before she gets a chance to make history.
Her memoir, Tough Choices, is due out from Penguin this fall, and she's signed on with the Washington Speakers Bureau.
Gov. Palin is a tough, aggressive politician who showed the country Thursday night that she was not going to hereafter be defined as the weak and vulnerable person we saw in interview clips all week.
This is one of the top women in her field, and she knows she faces a tough job.
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Johnson, a member of the tax-writing Ways and Means Committee and a strong supporter of a bill to revamp the IRS, will not know who her Democratic opponent is until the state's September primary, but she has had to slog through increasingly tough re-election races in recent years.
"She's a tough task-master, " says Sheila Dixit, an old family associate who is now Delhi's chief minister.
She is, for instance, about to finalise a settlement with Microsoft that many describe as disappointing, given how tough she has been with the world's biggest software firm in recent years.
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