Why would the capitalists let you vote away their wealth or power? What incentive do they have to do that?
That's defeatism.
No, it's a historical reality that voting is not an effective method to undo class society. Even the ancient greeks knew (before the Marxists rediscovered this and dealt their own death blows to representative government in the 1800s) that voting in an aristocracy is nothing more than theatre, because only the rich and entrenched families have the resources to fund campaigns, and get themselves elected (or appoint political puppets to do their bidding).
Political power is a reflex of economic power, and the rich will not allow you to use the system they control, to undo it.
single ant cannot destroy a tree. It's the work of countless ants that achieve that.
Many socialist / communist parties did just that, and they weren't deluded enough to try to accomplish it via voting in a system controlled by the ruling classes.
The article I posted above gets into this, but it was not. The British did not quit India because some guy went on a hunger strike, and they actively propagate pacifist myths like his because they are completely unthreatening.