I certainly don't expect the hearings to help the Dems. Given the current unemployment rate, I don't expect anything will. When have Dems ever NOT been completely demolished in an election with unemployment rates anywhere near this low?!
Right now, people are prosperous. An unusually large share of the population is pushing up in to higher tax brackets, and an unusually small percentage is unable to find work. That means a lot of voters think they'll benefit from the kinds of upper-class tax cuts Republicans champion, and not many voters think they'll ever need the kinds of social safety net programs the Dems fight for. This is how the Dems succeed their way out of office, again and again. Sooner or later, under Democratic rule, things are good enough in the country that a critical mass of people take prosperity for granted and are attracted to the GOP's messaging. Then they vote Republicans into power. Traditionally, that only changes after the GOP has utterly wrecked the economy.
You can see that in 1952 (Dems beat the Great Depression and brought us to ultra-low unemployment, so voters booted them, and Dems only got back in once Ike's third recession had driven unemployment rates up high in 1960).
You can see it in 1968 (Dems again brought us to ultra-low unemployment, so voters booted them, and they only got back in after the tag-team of Nixon and Ford had left the nation in ruins).
You can see it in 2000 (again, ultra-low unemployment, again a Republican took the White House, and held it until after his financial catastrophe reminded people why Dems are better).
And you can see it in 2016 (by then, Obama had cleaned up the Bush mess, we again had very low unemployment, and so the voters let Trump try his hand, until he plunged us into the deepest recession since the Great Depression).
That pattern suggests the Dems are in trouble, with unemployment already well below 4%.