MINNEAPOLIS (AP) – The divisive fight over the future of a crude-oil pipeline across Minnesota highlights the dilemmas for Democrats in a battleground state in the 2020 presidential race. And that could spell opportunity for President Donald Trump, who came close to winning the historically red state in 2016. Enbridge Energy’s plan to replace its old Line 3 pipeline has divided traditional Democratic constituencies in the home state of presidential candidate Amy Klobuchar.