You could, but you'd lose because of the age-old doctrine of implied consent. People impliedly consent to a reasonable degree of touching by entering crowds, etc. (What is "reasonable" is up to a jury, if the case gets that far.) Plainly the reporter did not consent to a yank on her arm, if (it's disputed) that occurred.
Full disclosure: in my opinion, Lewandowski did yank her arm and lie about it, and technically that's misdemeanor battery, but I would never prosecute such a playground level offense even if the evidence were clearer.
you can see on the tape the entire encounter, her body language, her balance, and that no “yank” occurred, at least by CL. Brushing past her in 2 seconds was so casual he didn’t even connect to the fact it had occurred