The first-in-the-nation contest between Hillary Clinton and Bernie Sanders is drawing closer as the Vermont senator prepares to head to the battleground state of North Carolina.
The race is shaping up to be a big one, and Clinton is taking aim at Sanders’ past record of opposing the Keystone XL pipeline, which she has touted as a model for her administration’s climate change policies.
In the Democratic primary, Clinton and Sanders each took turns sparring over Wall Street deregulation and Wall Street bailouts.
The fight for the Democratic nomination has drawn criticism from the business community and labor unions, which have sought to make inroads in the state.
Clinton has long been seen as the front-runner among the Democratic field for the nomination, and polls show she is well ahead in the polls nationally and in the Northeast.
But the fight for delegates will be tough, as it will be in a state where the turnout rate is lower than other battlegrounds, including Virginia, North Carolina and Ohio.
While Sanders has been the front runner in the past, the Vermont lawmaker has not won over the Democratic establishment in the way Clinton has.
The former secretary of state has held more town hall meetings in Pennsylvania than her Democratic rival, while Sanders has held his rallies in Philadelphia.
The contest is set to start early Tuesday in North Carolina, where the state holds its primary on March 15.
A total of 18 delegates are at stake, including two delegates to the Democratic National Convention.
The other delegates are awarded proportionally, based on the vote in the Democratic primaries and caucuses.
Sanders is the first senator to campaign in Pennsylvania since 2012, when then-Sen. Barack Obama (D-Ill.) won the state and its 11 delegates to its Democratic National Committee.
Clinton, who has campaigned in Pennsylvania twice, has held rallies in Pittsburgh, Harrisburg and Philadelphia.
Sanders is hoping to keep Clinton out of the state by showing up to campaign with her in a series of small town halls and other events that focus on the economy and the environment.
Clinton is expected to focus on education, energy and jobs, while Trump is expected be more focused on taxes and border security.