Yes, "leftist" is referring to the most radical part of the Democratic party, which is trending more socialist. So both parts are correct.
Harris, Feinstein and Pelosi are all pretty center, until 2011 they had a Republican governo,r and these tech companies and their values are decidely not liberal.
Further, Cali is home to some very conservative politics, Devin Nunes is way out there as is Kevin McCarthy.
The idea of leftist doesn't seem consistent with the usage.
Perhaps pondering that question will trigger a recalibration.