Everyone if Webb actually had a following amongst these supposed conservative working class Democrats he would've been able to poll more than the margin of error in any poll. He is irrelevant. Totally and completely. He's also probably the third most responsible person for the passage of Obamacare (after the late Arlen Specter and Al Franken) so yeah, not exactly the best choice to win over disaffected conservatives.
He might be able to win over disaffected moderates who aren't too pleased with Hillary (you know, the wife of the guy that signed NAFTA) but want to keep their Obamacare plan.
Well seeing as how: 1-Trump will still campaign on repealing Obamacare and 2-Webb supported free trade as a Senator, that wouldn't make much sense.