President Bush took credit yesterday for "keeping America safe" from terrorists since the Sept. 11, 2001, attacks, arguing that his administration had prevented more bloodshed at home through aggressive policies ...

Decius wrote:

That's inarguable. Why is "keeping America safe" in scare quotes?

Those are just regular quotes. It just means Bush used exactly those words:

While there's room for honest and healthy debate about the decisions I've made -- and there's plenty of debate -- there can be no debate about the results in keeping America safe. (Applause.)

RE: Bush Says His Post-9/11 Actions Prevented Further Terrorism