Collective action can certainly be powerful. But your plan seems to have some pretty glaring holes. Strikes aren't protected in the US for non-work-related issues, are they? And you'd have to decide when the strike ends, i.e. when a "good" candidate is proposed, which everyone will have different opinions on. Seems to me the better move would be to be pushing for a rework of the voting system into one that allows voting for other parties without throwing away a vote.