"Why is the right so much more effective at organizing?"

Because they're funded by billionaires who literally dump money onto any project that might have a chance of increasing their power.

Also, "mainstream" politics is dominated by their sycophants.

@gwynnion I've been contemplating another burden in defeating the right. We have a system where 50%+1 (of rigged elections) wins power. There is not one united opposition to the right because everyone who is not corrupt/autocratic is outside the right. It's difficult to "win" campaigns that are ostensibly conducted on policy (a pretense of media & voters). The right lies with impunity. The non-right must represent all reasonable policy positions. The burden is too great.
@gwynnion I don't know if it's the same everywhere or has always been so but what's passing as the right in modern US democracy is anti-democratic. It's an assault against diverse representative government. Dems get a lot of criticism for campaigning "to save democracy" without providing material improvements. As they should. But in truth their fight is over process more than policies. If we subtracted autocrats we'd then have peaceful, logical debates with a wide range of views.