It may or may not help, but it certainly won't hurt. This is good messaging imo. Most people for the first few years of the tax plan will get a tax break. If the Dems want to challenge the GOP plan at all, it is not enough to say (the truth) that this is a giveaway to the rich and you're getting crumbs by comparison, because people will say "it's not crumbs to me" or that they like their crumbs. This sets up an alternative where there is no downside to the middle class - in fact there is an upside, but I understand it's difficult to convince some people that taxes actually pay for things.
That said, I think JimHammer you're buying into the mistaken view that Americans as a whole are economically conservative or libertarian. Higher taxes on the rich
polls very well.