No, I want them to already have values which align with my own.
What you're advocating is a politician who's corrupt and votes for legislation that's against my own interests (like the DMCA, Iraq War, etc.), and then only changes course somewhat after he/she finds out that position is too unpopular, so they change their rhetoric somewhat to try to appeal to the voters and keep getting re-elected. Meanwhile, the shitty legislation has already been passed, and they're not doing anything to repeal it.
The point of a democracy isn't to elect someone who will do the bare minimum to get re-elected, while passing as much stuff as they can for their corporate benefactors without pissing off their constituents too much. The point of a representative democracy is to elect candidates who share your own values, so that they can spend their time studying the issues in-depth and making sound decisions on them, because they may come up with a different decision after studying the issue for weeks or months than you would after reading some slanted "news" article for 1 minute.