For certain meanings of "leftist", one assumes? (e.g. "anyone more progressive than Torquemada)
Why can you not just accept the label, be proud of what you believe.
You really do need to get up-to-speed on your terms. The "leftists" on these forums, for the most part, have readily self-identified as not being Hillary supporters. Some, e.g. myself, are firm Sanders supporters who will support Hillary if/when she gets the nomination but only because the evils of the GOP are a greater concern than making a gesture at the polling booths.
You don't want to vote for her but you will, got it.