I don't think that it's about winning the election now. The dogs in the street know that Joe Biden is the 46th president. Trump needs to find a single case of vote tampering so he can spin it into "See I told you they were stealing the election. What else did they get away with? I'm the real winner. I was robbed." Ego, ego, ego.
Rudy, Graham, Cruz ect are seeking the support of Trump's hardcore base. They are casting themselves as defenders of democracy and the will of the people. The Trump cult will need new heroes and the aforementioned are falling over themselves to fit that role.