Millennial voters' preference for Democrats over Republicans is shrinking, per a new Reuters/Ipsos poll that showed in 2018, 46% of millennials favored Democrats and 28% preferred Republicans, compared to 55/27 in 2016.

Why it matters: "That presents a potential problem for Democrats who have come to count on millennials as a core constituency" and will especially count on that support in the 2018 midterm elections, per Reuters's Chris Kahn.