In my experience, no. The final straw for me was the Iraq WMD argument. The whole "Bush lied people died" line.
That argument was so lame and illogical, and no one would listen to reason.
The ‘ Bush Cheney pulled off the 9/11 attacks for their friends in the oil business ‘ is pretty close to when I learned you can not have a reasonable debate with these people.
Of course, listening to liberals proclaim ‘ oral sex isn't sex ‘ after President Clinton told them it wasn't should have been a strong clue that these fools will believe anything.