Well, as I am the election agent for the sitting MP in S. Norfolk, I'm not sure I can really keep my preferences to myself!
I'm not really sure that we have any good guide to which party to vote for on Faith grounds, and am sure I wouldn't want the US situation. I do, however, think that it is not compatible with my faith to vote for certain parties; those who do not welcome to strangers in the gate, for example.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)