Story highlights Overall, 33% of likely Republican primary voters say they back Donald Trump, giving him a 17-point edge

Over on the Democratic side, Bernie Sanders holds 58% among likely Democratic primary voters, well ahead of Hillary Clinton's 35%

Washington (CNN) Donald Trump holds a growing lead in New Hampshire, according to the latest CNN/WMUR tracking poll, while on the Democratic side, Bernie Sanders' still-wide lead is a bit smaller.

Overall, 33% of likely Republican primary voters say they back Trump, giving him a 17-point edge. After seeing his lead shrink to 11 points following a second-place finish in the Iowa caucuses, Trump once again more than doubles the support of his nearest competitor, Marco Rubio.

The race for second place has tightened once again, with the slight edge Rubio appeared to grab following his third-place finish in Iowa shrinking. Overall, 16% back Rubio, 14% Ted Cruz, 11% John Kasich, 7% Jeb Bush, 6% Carly Fiorina, 4% Chris Christie and 2% Ben Carson.

The poll was completed as Saturday night's debate in New Hampshire was getting underway, and the results do not reflect reactions to the debate itself.

Though support for both Cruz and Rubio is within the margin of error of where they were immediately post-Iowa, what had been a five-point gap between the two has narrowed to two points, suggesting the race for second place in New Hampshire is about as close as it was before Iowa.

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