What's interesting is that a candidate could rent, lease, or buy a Lamborghini as part of their campaign. That's perfectly legal!

The restriction is that they can only use that vehicle for traveling to/from campaign events. Since this is highly impractical and a waste of precious campaign funds, that doesn't usually happen.

Another interesting fact is that candidates can get reimbursement from their campaign funds for miles traveled in their personal vehicles (when campaigning).