What to watch in the US’s New Hampshire and Rhode Island primary elections

Voters in two US states — New Hampshire and Rhode Island — will head to the polls this week to select Democratic and Republican candidates for this November’s United States midterm elections .

In what’s been a campaign season full of unexpected twists and turns, from the continued growth of the Democrats’ progressive arm to mixed results for President Donald Trump-endorsed Republican candidates, the contests mark some of the last primaries before the US makes a final determination on which party will control both chambers of the US Congress.

Before that happens, candidates in some of these New England states’ most notable races will have to contend with some of this midterm’s biggest themes: How much Republicans should align with Trump, and whether a Democratic incumbent can fight off a primary challenger.

The most notable race in New Hampshire will determine the two candidates who will face off to replace outgoing Democratic Senator Jeanne Shaheen.

US Representative Chris Pappas has emerged as the frontrunner to win the Democratic nomination. On the Republican side, John Sununu holds the benefit of strong name recognition from being a part of the state’s most prominent political dynasty.

Democrats have hoped to retain this seat, a critical must-keep as they look to take back the US Senate currently controlled by Republicans. But recent polling of likely voters conducted by Senate Republicans’ campaign arm shows Sununu leading Pappas by one point. The survey, conducted in the final days of August, found nearly one in four voters are undecided.

However, both candidates, if they win their primaries on Tuesday, may have to confront actions by their party’s top figures, who could complicate their campaigns.

In the Democratic primary, Pappas remains the favourite, but his lead has dropped by double digits, according to some polls.