The Western Political Science Association will be in Seattle in April, and they are having a special poster session for undergraduates to present their research. A good way to experience conferences (the good and bad) and get some exposure for your work.
If you're interested check it out here: http://wpsa.research.pdx.edu/meet/
Deadline is September 16. Their form is a bit convoluted, so if you have any questions contact a department faculty member for help.