Can I call a campaign office and ask them to convince me?

I am leaning towards one of the candidates, but I have certain concerns and I’m not ready to actually vote for him. I’ve tried to research those concerns, but I’m just not getting anywhere. What I’d really love to do is to telephone (or email) that candidate’s campaign people, and invite them to respond to my questions and convince me to vote for their guy. Is there any way to do that?

I don’t see why not. Granted, they could always just hang up you. I’d just make sure it comes off as honest, not snarky. If you call them up and ask them ‘to convince you’, you might not get far, but I’d assume they’d answer any genuine questions you might have.
Literally, their only job is to convince people to vote for their candidate.

Having said that, you can probably expect boatloads of phone calls and text message at the next election. I’m not sure, but I assume you won’t get far without them taking down your name/phone/address etc.

Maybe for a local office.

For a major office, the campaign will send you an email at best. ‘Earn my vote!’ Hamlets are a time sucking black hole and volunteer time at the stage of the game is better used on Get Out The Vote of identified supporters.

In 2012 after Massachusetts had sent the third consecutive House speaker to prison, I decided to look into Republican candidates for the House. Our incumbent State Rep was a Republican, I called his campaign and spoke to one of his campaign office folks (something like deputy campaign manager).

I was 100% sure at the end of that conversation that I would never vote for that guy. Basically he was a corrupt, racist, nativist, birther before that was mainstream in the Republican Party. But the chap withdrew from the race anyway because of a personal and professional scandal.