Remember the titans went undeafeated for a long time in 2008 until their lost to the jets with a pretty good defense and running game.
All things being equal, the patriots with fred taylor, a healthy maroney, the upgrade in defensive backs, a 3rd year of moss, brady, welker, a defensive rookie of the year LB, and the fact that they have went 18-0 and came very close to go 19-0.
Considering all those things, the patriots have a really good chance of going 19-0 in 2009.
Remember the game against the ravens? on that last TD throw, the ravens droped like what 5 DBs back in coverage and brady still found gaffney in the endzone, its not like the ravens did an all out blitz, and the patriots got a fluke lob pass to beat the blitz.
In the superbowl, the patriots came a few finger lengths away from stopping the Buress touchdown.
If its any team in 2009 that can go 19-0 its the patriots, if its any team in 2009 that deserves to go 19-0 its the patriots.