Because that is who they are. As, in the Holy Bible, Jesus described Satan, so can Democrats be described.
They are liars, cheats ,and from championing abortion, accessories to murder. When thy speak, they speak a lie because they are incapable of the truth.
Those things are true, but the reason they cheat in elections is because if they didn't, they'd LOSE. They'd lose because they're the minority.
:^)