Well he did call McConnell a liar, do everything in his power to stop the Iran deal (including inviting Trump to a rally about it), stand up for Kim Davis, raise more money than any other candidate, and make clear that he will filibuster any budget with funding for PP.
But I guess you want him to engage in the silly bickering?
Bickering? No. But exposure would be great. The average voter doesn’t pay attention to the day to day business of the senate. Kim Davis is important but not to all the republican primary voters. You and I follow it. Exposure early is important especially for the non news followers.
BTW his lack of acrimony with Trump is a good thing.