Re: David Gergen Finally said something I agree with
As each of the parties has moved toward ideological purity, our politics have become ever more polarized, our governing ever more paralyzed. Extremists increasingly run the show.
Whoooop!! Whoooop!! False equivalence alarm!! 
He's half right. Because of historical accidents, both major parties in the US contained a variety of ideological positions from the late 19th century for about 100 years. No longer; for a variety of reasons we now have a liberal party and a conservative party. Conservative southerners who used to be Democrats are now Republicans, and all the liberals and moderates are gone from the Republican party, or are in hiding. One way or another, we're not going back. But he's 100% dead wrong on the second point. The Democrats haven't moved ideologically in the past 25 years. Obama is, if anything, a little to the right of Bill Clinton, and probably even to the right of Richard Nixon. The Republicans, OTOH, have over the past 20 years moved right at an ever-accelerating rate. This is not opinion, it's a demonstrable fact if you look at the positions they've taken on a variety of issues. Extremists are currently running the show only on the right.
"For a successful technology, reality must take precedence over public relations,
for nature cannot be fooled."
Richard Feynman