Why Can't Politicians.....
I know this problem is more widepread than the political arena but an honest 'Ok, I got that one wrong, it's time to go back to the drawing board' would instil a lot more confidence in me than the constant lying.
It's not such a big deal. EVERYONE makes mistakes. It's when you try to pretend that you've got everything right or avoid the issue that problems arise.
"One Man's Ceiling is Another Man's Floor"