I don't think Castro will be the nominee... though I hope he runs (along with any other Dem who wants to jump in the ring)... But...
"Ladder Climbing"... so any other Presidential Primary candidate is definitely not inherently "ladder climbing" 
(BTW... some candidates from Red states have less opportunities to build their resumes via Senator and Governor)
Ladder climbing is bad when a former HUD secretary decides that he's ready for the presidency because he has a massive ego when there are plenty of better candidates for the job.
Everyone is trying to climb the ladder, but Castro is the type that jumps up in a blatant fashion. It's a negative personality trait associated with narcissism.
Again- narcissism is an inherent and necessary quality to some extent of any presidential candidate. Should Obama or Bernie have sat out of the Primaries because Hillary was "more" quality regarding political experience? Of course not.
