- Hillary Clinton leads Bernie Sanders, 48% to 42%, in Iowa, a Fox News poll shows
- Sanders is ahead in New Hampshire, with 56% support to Clinton's 34%
The Fox News survey shows
Clinton with 48% support to Sanders' 42% and former Maryland Gov. Martin O'Malley's 3%.
The poll is the first since mid-December that meet's CNN's polling standards and shows Clinton with a sizable lead over Sanders. It could signal that momentum is swinging back in Clinton's direction after Sanders surged into the lead in early January.
However, Sanders remains the front runner in New Hampshire, the first primary state, with a 56% to 34% advantage over Clinton, according to a Fox News poll of the Granite State
And Clinton's national lead among likely Democratic primary voters has narrowed -- but is still clear. She's up 49% to Sanders' 37%, a third Fox News poll showed
The Democratic nominating contest has tightened in recent weeks, with Sanders' singular message of addressing income inequality breaking through.
Clinton still holds significant advantages as the contest shifts from Iowa and New Hampshire to Nevada and South Carolina, two states with much larger minority populations -- among whom Clinton leads.
The candidates are set to participate in a town hall at Drake University in Des Moines, Iowa, on Monday night. It is being hosted by Drake and the Iowa Democratic Party and broadcast on CNN at 9 p.m. ET.