Oof:
Some supporters of Rubio say bad strategy, poorly run campaign killing his chances - The Washington Post
One of the more important things about being President is being able to appoint and delegate to good people who can get things done and are good at their jobs. One of the few things a Presidential campaign tells us about a candidate that's applicable to the Presidency is this.
Warning, partisan comment inbound:
So, just in case there was any doubt, Rubio is a completely, utterly, empty suit. The average manager at McDonald's is more qualified to hold an executive position like President than Rubio.