Why do Christian conservatives consistently vote on only two issues Gay marriage and Abortion?

Over the last 2 elections, we have allowed the politicians to "reduce" Christianity to two issues. Gay marriage, and abortion. Honestly millions voted on those two issue, and we all see where that landed us 8 years later. The church has a bad habit of "ranking" morality. That is we rank those two issues as being the highest on our morality scale. Here's a thought, when did it become moral for us to sit by and watch poor people starve, or children die because the have no health care, or prisons being filled to capacity with young men who should be filling colleges and universties instead. When did it become moral to preach prosperity while allowing, thousands to die every day from HIV and AIDS. Why is it that we are so focused on saving the lives of unborn children, yet we care nothing for those children who are already here. How is it that we preach about the sanctity of marriage, when the divorce and infidelty rate within the church is rapidly increasing as we speak. Morality is much larger than protesting gay marriage and abortion