Assuming Gillibrand leans left as I believe she will, I will be throwing my full support behind her. I will probably campaign for her. McCarthy is far too militant about her positions and completely unwilling to even give Gillibrand a chance to prove herself. I have no interest in that kind of disregard for NYers, sacrificing the image of our Senator to further her own ambitions.
McCarthy has stated she would rather someone younger challenge Gillibrand instead, but if no one else did then she would jump in. As far as not letting Gillibrand prove herself, well perhaps she should, but McCarthy is basing it off of Gillibrand's record in the House, her A NRA rating, that bill she co-sponsored in the House, which past the House, but died in the Senate.
We will see what happens with Gillibrand's record in the Senate, and if she does move left I will likely support her. However, I do see where McCarthy is coming from, considerng Gillibrand's overall voting record, especially on an iaaue that is very important to McCarthy with what happened to her husband and son.
I definitely agree that if she doesn't moderate her views she should be primaried, but to assume that she won't is just completely dishonest. Any good politician (and hey, she got herself the Senate seat so she can't be that bad) would know how to play to their constituency. I expect no less from Gillibrand.