How to write a compare contrast essay on 2 political issues

The two political issues I'm writing about are Obama view on immigration and same sex marriage and Romney view on the same subjects. I need help on my intro this essay is suppose to be 4pages long double spaced

Is this a college essay you're trying to write?

Yes it is

I'm not sure a college essay on politics would be the way to go.

If i'm understanding correctly, and correct me if i'm wrong; but it'd be hard to write an essay on politics without sounding biased in some way.

Please, if you can, help me on my essay/supplements!

Well I have to give my opinion in each political issue as well I just need help in my intro paragraph

Someone please give me some ideas!