Skip it: A generic conspiracy thriller that struggles to qualify as average, "The Sentinel" has no forward momentum to keep you chasing after its predictable plotting. You'll be on the edge of your seat only if you doze off.
Bottom line: The cast, including Eva Longoria as rookie-agent eye candy and Kim Basinger as an improbably hot first lady, seems as uninterested in "The Sentinel" as you will be. You've seen this movie a million times; no need to make it a million and one.
Bonus: Test your investigative skills by trying to identify any character's motivation for assassinating the president. We seem to have missed it.