No, not true enough.
ACU Rating lifetime
Allen 92%
Burns 91%
Santorum 88% Talent 93%
ACU Rating 2005
Allen 100%
Burns 100%
Santorum 92%
Talent 84%
The party as a whole, starting with the President, did abandon many of (what many of us thought were) its principles, notably the idea of limited government, even if there are some guys who are exceptions.
Add to this a war in which a decisive victory has not been achieved, and you've got defeat.