Front the article:

"By raising the stakes over the torture issue with his repeated appearances, Dick Cheney isn't merely daring Democratic Congress and the Obama administration to investigate him and other members of the Bush torture team. Cheney's is a scorched earth game he believes he can win.

Cheney's MAD strategy goes something like this. If the DOJ or Congress proceeds with torture probes or prosecutions, Republican retaliation will be massive and total. Nominees will be blocked, legislation filibustered and the gridlock in Washington permanent. The blame for the carnage, the theory goes, will go to the side (in this case, Democrats) which launched the first strike. As Ronald Reagan was fond of saying, "a nuclear war cannot be won and must never be fought."