My understanding is that he isn't running for office yet. He's running for a party's nomination for president.
If he wins that, then he's running for president and states will have to decide whether he can be on the ballot.
I know it's a fine distinction, but if they ruled otherwise, it would get overturned.
We have backlogged projects, let alone maintenance on existing infrastructure, not even getting to the costs of upgrading ancient infrastructure - a lot of municipalities still use clay pipes.
Right now deferred maintenance is roughly a trillion dollars.