Show me a Democrat candidate who prioritizes Palestine and I'll be happy to vote for him or her. Otherwise GTFO with that two-dimensional sheeple bullshit.
Because the Democratic candidate is will be more supportive of Palestine than the Republican candidate. Not to the extent you want but in American politics its a two person choice. Vote your heart in the primary, vote the least worst option of the 2 major party candidates in the general. That is how the system is setup and functions. Voting green is implicit support for the Republican candidate.
We had significant support for third party candidates in 92, 96, and 00. In all 3 cases all it did was hurt the candidate from major party whose views was closest to that of the third party candidate. And make voters LESS likely to vote third party because in the end many saw all it did was help the candidate they were most opposed to.
Ask a Ralph Nader voter from Florida how they felt after the election back in November 2000. For a while there liberals were more angry at him than they were Bush.
Voting third party is and will remain a round about method of voting for the opposing party farthest from your views unless there is MAJOR electoral reform, until then yes by voting green you are effectively voting Republican. And is how your support will be perceived by most on the left.