Ayotte or Craig will replace Republican Chris Sununu, who announced last year that he would not be seeking reelection. Sununu has been in office since 2016, serving four two-year terms. Before announcing he would not seek reelection, Sununu considered becoming a candidate for president, but he eventually decided not to run.

Kelly Ayotte and Joyce Craig are locked in NH governor's race that is closest in the nation. Here are 6 key issues that could prove decisive.

Over the course of her campaign, former New Hampshire Senator Kelly Ayotte has used Massachusetts as a stand-in for her criticisms of former Manchester, N.H., mayor Joyce Craig.