All of those were contentious statements- Clinton (-16% favorability now) having a high approval rating? Sanders (a progressive) voting against a key progressive issue
five times? The auto industry having the absolute
best year in its history?
They also aren't shying away from picking up "obviously false" statements by Democrats-
"If you like your insurance, you can keep it."
"I'm the only candidate in the Democratic primary, or actually on either side, who Wall Street financiers and hedge fund managers are actually running ads against."
"I remember landing under sniper fire."
Obama "basically threatened to bomb Pakistan."
The Foreign Intelligence Surveillance Court "is transparent."
How do you even determine whether a statement is "obviously true" or "obviously false" just by looking at it? I'd understand your argument if Politifact checked the accuracy of someone saying "the sky is blue" but everything they evaluate has political weight and is certainly something I'd check after watching a debate or hearing a speech if I had the time. Also, it's a bit hilarious that you tried to demonstrate your point by picking statements rated True/Mostly True by Dems and Pants on Fire by Republicans.
Of course the Pants on Fire statements you picked are gonna be "obviously false"- if they weren't, you wouldn't have picked them!
Even if you disagree with their analysis and conclusions, I think it's at least worthwhile to read their documentation. You can find some for Trump's claims about Clinton and Benghazi:
http://www.politifact.com/truth-o-meter/article/2016/jun/22/fact-checking-donald-trumps-speech-about-hillary-c/
Edited 6/25/2016 01:22:07