One of the questions brought up was whether evangelicals should be concerned with left wing or right wing politics, but rather with biblical justice, mercy and grace.
Does the US anti-immigrant policy and sentiment fly in the face of the gospel?
Do people notice this hypocrisy in evangelism and thus tune out the gospel of Jesus because evangelicals don't care about the poor, the tired, the huddled masses?
One issue with the concept of Biblical justice is that ultimately it ends up as a matter of how best to administer it. Do we take responsibility ourselves (local charity, promoting self-reliance) which inevitably turns into a presentation of more traditionally right-wing viewpoints, or do we look to some level of government to oversee the process (central charity, funded through taxation) which inevitably turns into a presentation of mroe traditionally left-wing viewpoints.
Of course an associated issue is that much of what is said by both sides is an exercise in dodging the issue. Many on the right look to the concept of private charity and encouraging self-reliance. Needless to say that means Someone Else gets to deal with the requirements for local charity because obviously it's not my responsibility, Someone Else gets to metaphorically teach the man to fish and support him while he learns because, you know, it's not my responsibility to do it. And then many on the left look to the concept of government programs and figure that Someone Else can pay the taxes required to support them because, you know, it's not their responsibility - "the rich" should pay more to help. And along the way it's so easy for both sides to lose sight of the point.
I think the parable of the Good Samaritan contains much more than we initially give it credit for. The Good Samaritan (a member of a despised race so, depending on the audience, nowadays this person might be a Mexican, an Arab, maybe even - gasp - a homosexual). He saw a man in need of help, so he set about helping. He didn't shrug and figure someone else was better qualified than him, he didn't start a campaign for higher taxes to help people like that, he just got on with what was needed. Then when he had to go on his way he took the man to an inn (not to his own house, but to a place designed for people passing through) and told the inn keeper to look after him and he would pay the bill. He didn't tell the innkeeper to give the man an open bar tab, didn't arrange to meet the man's every desire, but did arrange for the man's needs to be met.
I think far too often those on the right err towards just leaving the weaker members of society behind while those on the left err towards excessive generosity funded on the backs of others.