The reach of any one person without an amplifier of sorts (traditional media, facebook popularity, etc), is essentially zero; Even in the extremely unlikely case that you've changed the minds of 1,000 people you talked to (because to change 1,000 people's mind and vote, you need to speak to 20,000), it's still a rounding error.
It will make you feel good that you tried while you're at it, yes. It will also demonstrate how powerless you are if the results go against your wishes (or falsely make you think you contributed if they go your way).
It's the same as fighting the centralization of the web, the big brothering of facebook/nsa, etc - you have to mobilize people to act, many of them. And sadly, it's very rarely possible or within one's power.