She crushes potential Dem competitors in early states but is vulnerable to GOP matchups.
Rand Paul gets highest numbers in both states among Republicans.
A Gallup poll found 91 percent of people are familiar with Clinton.
Fifteen percent approve of the way Congress is handling its job, according to a new poll.
Hillary Clinton also sweeps the potential 2016 Democratic field for president.
Sixty percent of people said they identify with one of the two major political parties.
The confidence rating for the presidency marks a six-year low.
Democratic pollster Stan Greenberg says the right message to appeal to the critical bloc could boost them in the midterm elections.
Bill Clinton and George H.W. Bush were rated most popular living leaders, a poll finds.
NBC/Wall Street Journal poll shows deep divide within the GOP on hot-button issues.