(So as not to be misunderstood, let me nuance a position on immigration. When others want to come here to enjoy the essentials of what makes America so attractive in the first place, fine -- but we need to shape and steer the immigrant experience so those essentials aren't lost. For example, a common language and a common commitment to work have been great strengths of America. Multilingualism and welfare availability for immigrants could help to destroy precisely what has made America attractive.)
But back to the main point: Like it or not, today we have pluralism by providence, an abundance of Madisonian factions, religious and temporal. Christianity (in terms of more than nominal identification) is a minority religion in America, a faction powerless to dominate others. That realization should free non-Christians from fear of religious domination, and it should push Christians to work alongside other groups that also oppose the truly aggressive force of our age, secular liberalism.
Author-theologian Francis Schaeffer emphasized the importance of falling neither into separatism nor into easy alliance. Instead, he urged Christians to think through co-belligerency, working in coalition with other groups against a common enemy, while retaining independence. Sometimes we may find strange bedfellows. And that's my advice to Dennis Kucinich: You can find lots of backers for your single-payer schemes, but if your future wife is not one of them, you can still get along.