GOP talking points on Bush's speech tonight

Think Progress has 'em. So do right-wing pundits. Here's one:

n Senator Frist and Speaker Hastert have indicated that Congress will conduct a thorough investigation modeled after some of the most serious investigations that Congress has ever undertaken: the 1973 Watergate Committee, the 1987 Iran Contra Committee, the 1994 and 1995 Whitewater Committees and the 1997 Campaign Finance investigation.

Hmmm. What's different about the investigation the GOP Congress proposes to conduct into the botched Katrina response and those others?