1
Other national polls have shown Clinton's lead shrinking over the past week.
2
Clinton's lead over Trump in national polls has widened in recent days.
3
But many national polls have found the race tightening in recent days.
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Discusses national polls concerning Nixon: most Americans distrust him but fear impeachment.
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The prime-time debate will feature the top 10 candidates in national polls.
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Mr Sanders is leading national polls, and he has all the momentum.
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The two contenders have been running close in national polls for months.
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Until a week ago he trailed Sanders in most state and national polls.
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Clinton leads Trump by about 5 points in some national polls.
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Michelle was worried about the national polls: Why aren't we moving?
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Trump has been leading national polls of Republican voters for months.
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But Trump has neither backed down nor has he dropped in national polls.
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The BJP is the frontrunner in national polls due by May.
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For months, he barely registered in state and national polls.
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Over the past few weeks, Clinton's lead in the national polls has slipped considerably.
16
Many national polls in recent weeks have already shown U.S.
