Democrats want lower taxes on the middle class and higher taxes on the wealthiest. And no, the wealthiest never pay their advertised tax rate. That's just another talking point (scam)
Democrats want to increase the purchasing power of the take home pay of the worker making the median wage. Raising taxes or lowering taxes is a tactic not a goal.
Here's a FDR quote so we can have a clear definition on what it means to be a Democrat:
"An old English judge once said: 'Necessitous men are not free men.' Liberty requires opportunity to make a living - a living decent according to the standard of the time, a living which gives man not only enough to live by, but something to live for.
For too many of us the political equality we once had won was meaningless in the face of economic inequality. A small group had concentrated into their own hands an almost complete control over other people's property, other people's money, other people's labor - other people's lives. For too many of us life was no longer free; liberty no longer real; men could no longer follow the pursuit of happiness.
Against economic tyranny such as this, the American citizen could appeal only to the organized power of government."
Speech before the 1936 Democratic National Convention
Since the Democrat party has been taken over by Republicans it is more like Republican Lite.