Agreed that Rubio has hurt himself.
First, he can’t do the attacking thing as well as Trump.
Second, and far more importantly, for someone who condemned Trump for going into attack mode to then do EXACTLY THE SAME THING is just hypocritical (i.e. a sack of lies) - and people are VERY sensitive to that in this cycle.
Bottom line: Rubio didn’t hurt Trump, he hurt the Republican Party by engaging in that game at the debate and since. He has shown himself to be very un-Presidential. He will not win a single state today, and he will lose Florida in 2 weeks - nothing he did will change those facts.
Seriously, dick jokes? That just tells me they were reading the magazine article about a story regarding Spy magazine and Trump's hand and the hacks that work for Rubio wrote a joke about it. That hand joke comes from an old Spy magazine satire article which got a mention because Trump traced his middle finger out and mailed it to the editor.
The GOPe Rubio opposition research people read that article just like I did (I think on Vanity Fair) or saw a mention of it on a TV comedy show and then programmed Rubio to do the joke. Without any understanding of what they should be doing in the Trump style.