At first, Democrats tried to complain that the economy wasn't thriving under Trump. Then they claimed that it only benefited the wealthy. These became untenable positions as the longest bull market in history pushed the unemployment rate down to a half-century low and as real wage growth rose for the first time in a decade. Further, when it turned out that wage growth was disproportionately benefiting low-income earners and employment benefiting disaffected workers, they had to pivot, claiming that if Trump deserved any credit, then Obama deserved just as much.
The public doesn't seem to buy that line, either. Gallup found that a record number of people report that they're better off overall now than three years ago and also that they're better off financially than they were a year ago — and that they overwhelmingly credit Trump for this.
In Gallup's December polling, a staggering 84% of those polled said that the economy was "extremely" or "very" important, more than any other issue. At the bottom of that scale, the least important issues were gay and transgender rights, wealth distribution, and climate change.
Not only do people recognize that they're individually benefiting from the economy, but they're also crediting Trump for it. And it's the issue they care about most when they vote.