If Teachout enters the primary again it could be a much tougher challenge to Cuomo now that she is more well-known and would have Sanders to fundraise for her.
Zephyr Teachout defeating Andrew Cuomo and being elected Governor of New York would have massive implications for the national Dem party - it would deliver a death blow to Cuomo's Presidential ambitions and position the party for another progressive vs. center Presidential primary.
Teachout has to be careful to not become the liberal version of Tark.