…without being informed.
The right to vote is an important one and should never be taken lightly. Voting on a whim and without good reason is just as bad as not voting. Being an informed voter takes time and effort but is necessary to making a good decision. Easy information isn’t necessarily good information. I wonder how many votes have been cast on the basis of a candidate’s appearance or a good sound byte?
I respect anyone’s right to vote for whomever they choose, but I hope for the good of our country and each other they have good reasons for the vote they cast.

I agree. One should be informed. A few places to try are:
Project Vote Smart
http://www.votesmart.org/
USA.gov Voting and Elections Page
http://www.usa.gov/Citizen/Topics/Voting.shtml
And if you live in California, try this guide from the League of Women voters
http://www.easyvoter.org/
For candidates to Congress, check out the official THOMAS database at http://www.loc.gov and see what sorts of bills your member of Congress is sponsoring.