I will say this, the vast majority of Democrats have been very respectful of Kirk's death. I watched a lot of CNN yesterday, and from what I saw they were nothing but respectful and even honored him (unfortunately, I can't see the same about MSNBC).
Hopefully, both sides can rally against political violence. To do so, both parties need to mind their own store and challenge the extremists on their side that spew hate. What Mike Lee said was inappropriate (but he didn't celebrate her death) and should have been chastised by his colleagues.