In reply to detruth.

Because we choose the one who comes closest to representing our best interests. This is how the entire country votes. There is no one group that gets everything they want from a president. You compromise for the best interest of the country, as a whole and for the best interest of your specific causes and needs. For example, that's why it's stupid to vote against immigration if the candidate who's for immigration is also for securing student loan debt forgiveness. You compromise on other issues if the issues that directly affect you are being addressed.