Running Against My Sister: AITA?

Am A- hole for running as a third party candidate against my evil sister? I,

46 M, am currently running as a third-party candidate, even though my older

sister, 50F, “Rebecca,” is running as the Republican nominee.

My whole family is furious. Since the U.S. uses a winner-take-all and Electoral College

system, they think my campaign will split the popular vote and keep my sister from getting

plurality in key swing states. They keep saying I’m “stealing votes,” “spoiling the election,”

and "handing the win to the other party.” My sister keeps blaming me every time her polling

numbers dip. I told everyone that I’m not trying to win, I’m only trying