Democratic Gov. Maggie Hassan narrowly leads incumbent Republican Sen. Kelly Ayotte in the New Hampshire Senate race, according to a poll commissioned by End Citizens United, a Democratic PAC. 

Hassan had a 47 percent to 44 percent edge over Ayotte, a slight improvement for the Democrat since GBA Strategies last polled the race in July and found it tied 47-47. Libertarian Brian Chabot took 7 percent — up from 4 percent in July.

The presidential race has tightened with Democratic presidential nominee Hillary Clinton leading GOP rival Donald Trump 43 percent to 37 percent. She had enjoyed a 10-point 48-38 percent advantage in July. Libertarian Party candidate Gary Johnson was at 11 percent and the Green Party’s Jill Stein was at 4 percent in this most recent poll. 

[Kelly Ayotte Easily Outruns Primary Opponents]

GBA Strategies surveyed 600 likely voters on land lines and cell phones from Sept. 25 to 27. Two-thirds of the interviews were conducted before Monday night’s presidential debate. 

Recent polling has given Ayotte a slight advantage. She led Hassan 47 to 45 percent in a Monmouth poll conducted Sept. 17-20. An NBC/Wall Street Journal/Marist poll from earlier in the month gave the incumbent a 52-44 percent edge among likely voters. 

New Hampshire’s Senate race continues to be among the closest in the nation, with each side’s ground game likely to be an important factor on Election Day. The Rothenberg & Gonzales Political Report/Roll Call rates the contest a Tossup.