When discussing politics with people, you will, no doubt, encounter ideological voters. These type of voters cross all party lines. They vote without the knowledge of how everyone else is feeling/tilting. Not a smart move. When it's a blowout race, sure, go for the 3rd party or don't vote for the lesser of two evils. But when it's a close race, your vote matters that much more.
Get informed! And yes, numbers matter.
This is a bipartisan message.