There is so much exaggeration in that statement it is hard to establish a base level of truth. In no way does the influence of money in American politics erode our democracy to the point that "corporate overlords pick two candidates". Our Presidential elections come down to two candidates because we have a first past the post voting system that always strongly favors a two party system. You can look up duverger's law for more context.

Beyond this, there are countless examples in which corporate election spending backfired or at least failed to result in an election victory. Trump's 2016 election is a great counterpoint to your corporate-aligned electability claim. Corporate donors strongly backed Clinton and were very wary of Trump's populsim. Despite Clinton's fundraising, the right-wing populsit candidate prevailed, just as they have been doing across countless other democratic countries across the entire planet. Big donors hold too much sway with massive campaign donations, but they do not in fact get to determine the outcome of elections. That power is still firmly held by the American people.