What was the purpose of Cruz’s talkathon?

Sen. Ted Cruz, R-Texas, has ended his 21-hour talkathon, and it’s still not clear what its purpose was. It wasn’t a real filibuster, and Cruz admitted last week that the GOP doesn’t have the votes in the Senate to block Obamacare (let alone the votes needed to override a certain presidential veto). The view among many GOP senators is that Cruz was mostly interested in promoting himself.