Bernie Sanders, Joe Biden, and Elizabeth Warren are current favorites in the 2020 New Hampshire Democratic presidential primary, though most are still trying to decide whom to support. Interest in the primary is at an all-time high. Just over half of likely Republican primary voters plan to vote for Donald Trump, slightly lower support than Barack Obama received among Democrats at the same point in his first term.
UNH Survey Center
Survey Center, UNH, "Sanders, Biden & Warren Current Favorites For 2020 NH Primary; Interest in Primary at All-Time High 8/23/18" (2018). All UNH Survey Center Polls. 2.