US presidential hopefuls Sanders, Clinton in dead heat: Reuters/Ipsos poll

Will Clinton's Ground Game in NH Save the Day?

NEW YORK (Reuters) -- Vermont Senator Bernie Sanders has erased Secretary of State Hillary Clinton's wide lead for the Democratic presidential nomination since the start of year, putting the two in a dead heat nationally, according to a Reuters/Ipsos poll.

Clinton leads Sanders 48 percent to 45 percent among Democratic voters, according to the poll of 512 Americans, conducted Feb. 2-5 following the Iowa caucus. The poll has a credibility interval of 5 percentage points.

RELATED: Sanders & Clinton at the CNN town hall:

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Bernie Sanders, Hillary Clinton Town Hall
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US presidential hopefuls Sanders, Clinton in dead heat: Reuters/Ipsos poll
DERRY, NH - FEBRUARY 03: Democratic Presidential candidates Hillary Clinton stands with CNN anchor Anderson Cooper during a CNN and the New Hampshire Democratic Party hosted Democratic Presidential Town Hall at the Derry Opera House on February 3, 2016 in Derry, New Hampshire. Democratic and Republican Presidential are stumping for votes throughout New Hampshire leading up to the Presidential Primary on February 9th. (Photo by Justin Sullivan/Getty Images)
DERRY, NH - FEBRUARY 03: Democratic Presidential candidates Hillary Clinton sits with CNN anchor Anderson Cooper during a CNN and the New Hampshire Democratic Party hosted Democratic Presidential Town Hall at the Derry Opera House on February 3, 2016 in Derry, New Hampshire. Democratic and Republican Presidential are stumping for votes throughout New Hampshire leading up to the Presidential Primary on February 9th. (Photo by Justin Sullivan/Getty Images)
DERRY, NH - FEBRUARY 03: Democratic Presidential candidates Hillary Clinton stands on stage with CNN anchor Anderson Cooper during a CNN and the New Hampshire Democratic Party hosted Democratic Presidential Town Hall at the Derry Opera House on February 3, 2016 in Derry, New Hampshire. Democratic and Republican Presidential are stumping for votes throughout New Hampshire leading up to the Presidential Primary on February 9th. (Photo by Justin Sullivan/Getty Images)
DERRY, NH - FEBRUARY 03: Democratic Presidential candidates Hillary Clinton stands on stage with CNN anchor Anderson Cooper during a CNN and the New Hampshire Democratic Party hosted Democratic Presidential Town Hall at the Derry Opera House on February 3, 2016 in Derry, New Hampshire. Democratic and Republican Presidential are stumping for votes throughout New Hampshire leading up to the Presidential Primary on February 9th. (Photo by Justin Sullivan/Getty Images)
DERRY, NH - FEBRUARY 03: Democratic Presidential candidates Hillary Clinton speaks during a CNN and the New Hampshire Democratic Party hosted Democratic Presidential Town Hall at the Derry Opera House on February 3, 2016 in Derry, New Hampshire. Democratic and Republican Presidential are stumping for votes throughout New Hampshire leading up to the Presidential Primary on February 9th. (Photo by Justin Sullivan/Getty Images)
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Democrats had been supporting Clinton by more than a 2-to-1 margin at the beginning of the year. Sanders has narrowed that lead considerably over the past several weeks.

Clinton beat Sanders narrowly in the Iowa caucuses, the nation's first nomination contest ahead of the November election, but is expected to lose to him in New Hampshire. The two rivals clashed on Thursday night in their first one-on-one debate, reflecting the tightness of the race.

RELATED: Sanders & Clinton go head-to-head:

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Democratic Debate, Feb 4 2016
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US presidential hopefuls Sanders, Clinton in dead heat: Reuters/Ipsos poll
US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders shake hands as they participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
US Democratic presidential candidate Bernie Sanders participates in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad / ALTERNATE CROP (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
US Democratic presidential candidates Hillary Clinton arrives on stage before participating in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / JEWEL SAMAD / ALTERNATE CROP (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders chat during a break as they participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidate Bernie Sanders leaves the stage during a break as he participate in the MSNBC Democratic Candidates Debate with Hillary Clinton at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidate Hillary Clinton participates in the MSNBC Democratic Candidates Debate with Bernie Sanders at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) shake hands at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.Ã (Photo by Joe Raedle/Getty Images)
DURHAM, NH - FEBRUARY 04: The stage is set for the start of the MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016. Democratic and Republican Presidential candidates are stumping for votes throughout New Hampshire leading up to the primary on February 9. (Photo by Joe Raedle/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) stand next to each other at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.Ã (Photo by Joe Raedle/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) stand next to each other at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.Ã (Photo by Joe Raedle/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
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There is still a wide gap between the two in name recognition nationally. Nearly a quarter of Democrats and two-fifths of Independents say they are still not that familiar with Sanders. In comparison, Clinton has almost total name recognition among voters.

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