A government shutdown, a seemingly unending trade conflict, a Democratic takeover of the House of Representatives that has energized the party’s left, a parade of contenders for the Democratic presidential nomination—professional investors have had a cascade of political news to digest since Barron’s published its fall 2018 Big Money poll of professional investors in October.

In the spring survey, as with last fall’s, we asked participants to share their views on political and policy issues. Based on poll results, America’s...