Many likely voters say they don't know enough about both vice presidential candidates to have positive or negative thoughts about them going into Tuesday night's debate, according to a new NBC News|SurveyMonkey poll.
The poll found that 40 percent of likely voters said they didn't know enough about Virginia Sen. Tim Kaine, while 33 percent said they didn't know enough about Indiana Gov. Mike Pence.
Of those surveyed, 56 percent of Democrats and those who tend to lean toward Democrats with an impression of Kaine said it is favorable. Sixty-six percent of Republicans and Republican-leaners said they have a favorable impression of Pence.
Both candidates will seek to give themselves a greater presence among voters during tonight's debate.