Winning elections has been about motivating one's base and suppressing the opposition's turnout since, well, the beginning. With big data and microtargeting, the belligerents got a lot better. As in down to the individual voter. First with doorbelling, direct mail, and phone banking. Now they've added social media.

If you want to stop this ballot chasing, advocate for compulsory voting.

(IRV, another suggestion, is one way to break the current duopoly. It'd do nothing about ballot chasing or suppression.)