I have been saying this for a while now, people don't want to be bothered at home. I have been suggesting that people just leave some information on the doorknob.
People don't want to lose their shirt to inflation or get drafted and killed in Iraq, either. Desperate times call for desperate measures.
If you just leave information, this is what your strategy depends on:
1) that they see it, and it doesn't just blow away/get stolen by garden gnomes
2) that they read it without just tossing it
3) that they see enough to go look more
4) that they bother to decide they want to vote for him
5) that they remember later and actually go vote
6) that they do that for the primary and not just wait for the general
You can have whatever opinion you want but actual history of elections in America say this is a failing strategy.
If you talk to them you move responsibility for 1, 2, 5, and 6 (at least) to you instead of them. You can't decide for them to vote for him but you can make sure they get the info, process it to some extent, and if they will vote for him that they actually get to the polls at the right time.
Yes, you also incur some risk of turning off a person who maybe would have voted for him (if they remembered) but won't because someone knocked on their door, but I'm sorry, that's a much lower risk than depending on individuals to think about the election and go out and vote because someone left a flyer on their door. In the precincts I've walked (including my own) the average ratio of people that were glad I'd come talked to them vs. people who said "go away not interested" is probably 3 to 1. The ratio of people at home vs. no one answered is at least 1 to 2, though, so don't worry, you'll have plenty of chances to just leave lit and not have to talk to anyone.
The campaigns that do this part better than the others are the ones that win.