From CNN Poll held in February 2018:
Health care and gun policy are deemed deeply important by about half of voters (53% and 49%, respectively, call them extremely important), while about four in 10 say they are as motivated by the economy (43%) and immigration (38%). Sexual harassment is a sharp motivator for 36% of voters. Taxes, an issue Republicans have said will move voters as they realize the benefits of the tax changes passed last year, is extremely important for 35%. The investigation into Russian meddling in the 2016 election rounds out the list, with just about a quarter (26%) calling that extremely important to their vote.