because of the democrat's entrenched interests with arms dealers, tech monopolies, neocolonial hedge funds and asset firms, and billionaires like Soros and Buffet and their companies, big banks (Citigroup hand-picked Obama's cabinet and influenced his Fed choice of one of their executives who also oversaw Israel's central bank; him bailing the banks out was not an anomoly), etc. they are structurally incapable of reorienting to the left to capture any of the (growing and increasingly impoverished) working and lumpen voters on the left, so have to fight over the (ever shrinking and rightward-moving under crisis) bourgeois and petty bourgeois voterbase with the Republicans. Who would vote for their wallets (tax cuts deregulation etc) before caring about any of the surface level social issues the democrats pretend to care about (and pretend less and less)

It is their downfall. It is why we need to vote and agitate for and uplift the PSL (and even help Greens etc. who want the duopoly broken too and can be useful) and agitate to furthur rupture these intractable contradictions between the democrats' actual base and their interests and platform. The breakthrough is in the moribundity and redundancy of the democrat party compared to the republicans which is exposed by by starving them of the working class margins they need if they ever want power again and force them into untenable positions. Either the ruling class floats a progressive "labor" reformist party like the greens or another and breaks the democrats in half with half joining republicans outright and half flooding the reformist party in hedge-betting (alienating the reformists' left wing into socialist ranks); or they don't float a reformist party and coalition with the republicans like they seem to be doing and the left only grows exponentially because nobody in the broad working masses even had illusions about the republicans in the first place and parties like the PSL will have very little resistance to growing and rising by that point and risks for the ruling class allowing a dual power scenario to grow and take root. Either way this will all force an inward-facing and chaotic reorientation in the bourgeois politicians who have clearly forgotten how to play politics, in the face of a rising left, which only helps the victims of imperialism abroad and creates fertile ground for socialist growth in countless ways.