Most recent studies of deep canvassing (redone to fix the fabricated data) indicate that a strong, empathetic listener with leading questions has only about a 10% success rate.

Note this is NOT shooting out facts, not necessarily a close individual who you've built repoire with, and in fact almost zero talking. AND it persists for at least 3 months!

It's small, but it's also viable and completely different than what most people I know think of when we go out to "change someone's mind."