She might just think she is smarter than she actually is.

McCain was the moderate who brought in the big bucks by reaching across the aisle 'every once in awhile' but she took it to a stupid extreme and is now cornered by the backlash her overreach has caused.

Toxic representatives and senators tend to end up as talking heads on TV or if they are lucky hyperpartisan thinktanks, but who the hell is going to hire someone this unlikeable by her own party? She can't lobby anyone, she isn't burning bridges she is burning the whole town and salting the earth.