What is a Libertarian?

The libertarian, or 'classical liberal' perspective is that individual well-being, prosperity, and social harmony are fostered by 'as much liberty as possible' and 'as little government as necessary.'

Ask yourself these questions...
How much liberty is good for the individual?
How much government do we need?

For more information...
Read Wikipedia
and I recommend reading Henry David Thoreau's book Walden.