Newly installed Virginia Gov. Abigail Spanberger will give the Democratic response to President Trump’s State of the Union address tonight.

Democrats hope Virginia Gov. Abigail Spanberger can deliver a forceful response to President Donald Trump’s State of the Union address that sharpens their message heading into the midterm elections

And indeed, Ms. Spanberger plans to address key themes she campaigned on when she follows Mr. Trump on Tuesday night: affordability, the chaos instigated by the president both in America and overseas,...