I think he suspended his campaign. Suspending means that while for all intents and purposed but one, the campaign is ended. The exception is that it allows the candidate to raise money (usually to pay off campaign debt). Ending a campaign means you hold the bag, if you're in the red, as I understand it.
Actually your candidacy is its own separate legal entity, so you're not legally holding the bag. However your reputation is at stake, if you ever want to run for public office in the future, nobody will lend you money if you've proven to be a bad credit risk in the past.
So, technically, yes, still a candidate.