- Errol Louis: Marco Rubio forgot a cardinal rules of presidential campaigns: No substitute for ground game
- Iowa in early January, Rubio had one minor field office, says Louis
- If he learns from his mistake, Rubio may yet have a bright political future, says Louis
(CNN)Sen. Marco Rubio seemed as stunned as his followers at how completely his presidential campaign collapsed. "It is not in God's plan that I be president in 2016, or maybe ever," he told a crowd of about 1,000 supporters as he suspended his run for president.