He was not way behind. Most outlets had him a couple points behind.
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As usual, you have absolutely no idea what you are talking about. Palin was the neo-con darling, and Kristol led the way over at the Weekly Standard. And the floor fight was predicated on Palin not being picked. I'll grant you that had Lieberman been picked (McCain's preference, BTW), there would have been a floor fight. But this would have occurred had anyone other than Palin been selected. So even though McCain wanted nothing to do with Palin, she was forced upon him by Kristol and his pals.
Palin was announced on August 29, 2008. She was his last "bump", and it did not last long.
https://www.realclearpolitics.com/ep...obama-225.html
Here's one of my sources.... https://www.newyorker.com/magazine/2...7/the-insiders.
I read the article. It says: 1) Kristol and others pushed for her as VP and 2) there was a threatened floor fight over Lieberman if McCain picked him.
The article does not say 1) that Kristol and others forced McCain to take her or 2) there would be a floor fight at the convention if McCain didn't pick Palin.
So, the article supports what I posted. It doesn't support what you posted.
I would say that would be a big part among others. Even earlier in W’s term, many conservatives also felt Republicans weren’t focused enough on the current debt levels and spending. Tea Party started during the the W presidency for sure and intensified under Obama which branched out after ACA.
Also, you could blame social media in general for today’s polarity intensification. Heck who thought there would be a 70 year old sending idiotic tweets. So yes, Trump has added to the division but not the whole reason.