Vote for "someone else" and don't buy into the two-party system. Our votes are basically ineffectual anyway.

"Our votes are basically ineffectual anyway."

That sentiment was quite prominent in 2000 during the Bush / Gore election. A lot of people voted for Nader hoping to legitimize a third party on the ballot. The common thinking was Gore and Bush were no different.

Given how world events unfolded, that view (in hindsight) was probably a pretty dumb one.

No, they are ineffectual, period. Read up on the Electoral College, who doesn't have to follow the popular vote at all if they don't want to.