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WASHINGTON (CNN) — While Hillary Clinton still maintains an advantage over potential GOP rivals in 2016, a new poll shows that her lead is narrowing.
And as her book tour has received extensive coverage, her support has dropped below 50 percent, according to the McClatchy-Marist poll released Thursday.
The survey also looks at the 2016 Republican primary and who fares best among the potential candidates.
Clinton vs. Republican
In a hypothetical matchup against Sen. Rand Paul, Clinton bests the Kentucky Republican, 48 - 42 percent, with 10 percent undecided. The 6-point margin is equal to the poll's sampling error, and the gap is narrower than in April, when Clinton had a 55 - 39 percent.
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Matched against Gov. Chris Christie, Clinton leads the New Jersey Republican, 47 - 41 percent, with 12 percent of voters undecided. That's down from her 53 - 42 percent advantage over Christie in April.
Clinton has also lost her wide margin over former Florida Gov. Jeb Bush, who she leads 48-41 percent, down from her 55-39 percent advantage in April.
Republican primary
The poll also asked Republicans and Republican-leaning independents who they would support in the GOP presidential primary. Like nearly every other 2016 poll, the McClatchy-Marist poll indicates there is no frontrunner in the race, and nearly a quarter of Republicans are undecided.
Bush and Christie tie for the top spot at 13 percent each, with Sen. Ted Cruz of Texas following behind at 10 percent. Rep. Paul Ryan of Wisconsin, who served as the 2012 vice presidential nominee, ties with Sen. Marco Rubio of Florida at 9 percent.
Paul and Texas Gov. Rick Perry tie at 7 percent each. Gov. Scott Walker of Wisconsin, former Sen. Rick Santorum of Pennsylvania, and Louisiana Gov. Bobby Jindal all receive less than 5 percent of support.
The poll also indicates that Paul, while trying to expand the Republican Party has lost support among tea party supporters. In April, he came in at 20 percent among tea party backers, with Cruz at 6 percent. Paul now has only has 7 percent support from the group, compared to Cruz at 15 percent — the top spot.
The survey was conducted on August 4 with 1,035 adults, including 806 registered voters, questioned over the phone. The registered voters' subset has a sampling error of plus or minus 3.5 percentage points. For questions about the 2016 GOP primary, 342 Republicans and Republican-leaning independents were interviewed, with a sampling error of plus minus 5.3 percentage points.
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