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Donald Trump's momentum continues

Donald Trump is running strong in the early nominating states of Iowa and New Hampshire, according to two new NBC News-Marist polls.

Donald Trump is running strong in the early nominating states of Iowa and New Hampshire, according to two new NBC News-Marist polls.

Trump leads the Republican presidential field in New Hampshire, getting support from 21% of potential GOP primary voters. He’s followed by Jeb Bush at 14%, Scott Walker at 12% and John Kasich at 7%.

RELATED: Donald Trump dominates media coverage among 2016ers

Chris Christie and Ben Carson are tied at 6% in the Granite State, and Marco Rubio and Ted Cruz are at 5% each.

In Iowa, Walker and Trump are in the Top 2 – with Walker at 19% among potential Republican caucus-goers and Trump at 17%. They’re followed by Bush at 12%, Carson at 8%, Mike Huckabee at 7% and Rand Paul at 5%.

The polls were conducted July 14-21 – so before and after Trump’s controversial comments belittling John McCain’s war record on July 18. And they suggest the comments didn’t affect Trump in Iowa (he was at 16% before the comments and 18% after), but they did hurt him in New Hampshire (26% before, 14% after).

Despite his poll position, Trump’s favorable/unfavorable rating among Iowa Republicans is just 45%/44%, and it’s 39%/53% among GOP voters in New Hampshire.

Hillary leads big in Iowa – but by a smaller margin in New Hampshire

Meanwhile, in the Democratic presidential race, the polls show that Hillary Clinton is ahead, but that Bernie Sanders has gained ground on her since earlier this year.

In Iowa, Clinton leads Sanders by 29 points, 55% to 26%, with Martin O’Malley at 4% and Jim Webb at 2%. In a February NBC-Marist poll of the Hawkeye State, Sanders was just 7% in a field that also included Vice President Joe Biden, who isn’t expected to run for president.

In New Hampshire, Clinton is ahead of Sanders (who represents neighboring Vermont in the U.S. Senate) by 13 points, 47% to 34%. They’re followed by O’Malley at 5% and Lincoln Chafee at 2%.

Back in February, Sanders was at 13%.

Both Clinton and Sanders are popular among Democrats in these two states. Clinton’s fav/unfav is 74%/20% in Iowa (+54), and it’s 71%/23% in New Hampshire (+48).

Sanders’ is 54%/15% in the Hawkeye State (+39), and 65%/14% in the Granite State (+51).

The popularity – or unpopularity – contest

But among all registered voters in these two presidential battleground states, the NBC-Marist polls finds that almost all of the major presidential candidates are unpopular – and that’s especially true for Clinton.

The favorable/unfavorable scores in Iowa among all registered voters:

  • Sanders +3 (30%/27%)
  • Rubio -1 (31%/32%)
  • Walker -1 (30%/31%)
  • Bush -12 (34%/46%)
  • Clinton -19 (37%/56%)
  • Trump -28 (32%/60%)

Notably, Clinton’s fav/unfav score in Iowa among all registered voters mirrors what a recent Quinnipiac poll of the state found .

The favorable/unfavorable scores in New Hampshire:

  • Sanders +12 (41%/29%)
  • Bush -5 (40%/45%)
  • Walker -6 (28%/34%)
  • Rubio -6 (28%/34%)
  • Clinton -20 (37%/57%)
  • Trump -40 (27%/67%)

Obama isn’t popular, either

The NBC-Marist polls also find that President Barack Obama is unpopular in both states. His approval rating stands at 43% in Iowa and 41% in New Hampshire.

And his fav/unfav numbers are upside down in both states – 46%/51% in Iowa (-5) and 43%/53% in New Hampshire (-10).

Majorities: We’ve had enough Bushes and Clintons

Finally, the polls show that majorities of voters in the two states (61% in Iowa, 55% in New Hampshire) agree with the statement – originally made by former First Lady Barbara Bush – that the country has had enough Bushes and Clintons in the White House, and it’s time to give someone else a chance.

The NBC-Marist poll of Iowa was conducted July 14-21 of 919 registered voters (+/- 3.2 percentage points), 342 potential GOP caucus-goers (+/- 5.3 percentage points) and 320 potential Democratic caucus-goers (+/- 5.5 percentage points). 

The NBC-Marist poll of New Hampshire was conducted July 14-21 of 910 registered voters (+/- 3.2 percentage points), 401 potential GOP primary voters (+/- 4.9 percentage points) and 329 potential Democratic primary voters (+/- 5.4 percentage points).