Nice try.
Open borders was a practice of numerous presidents, not just Bush.
And your Congress has been content to let it happen as well.
Well President Bush has taken it to a new level...or low depending on how you look at it.
So because other Presidents (and Congresses) have failed to enforce immigration laws we can't decide we have had enough and demand that they perform their constitutional duty? Sounds like the reasoning of a teenager. Because you let them get away with something a few times you can never again crack the whip.
Also, in my lifetime (born under Eisenhower) George Bush has been uniquely despicable in his arrogant refusal to enforce the people's laws, his contempt and distain for ordinary citizens and his refusal to even make gestures to the fundamental principle of our self-governing system -- the sovereignty of the people. For example, if you look at workforce enforcement statistics Clinton's last year in office saw over 1,000 enforcement actions versus something like 3 for 2004 by GWB.
In fact, in my opinion no President during my lifetime has ever needed impeaching as much as GWB, including Clinton, whose impeachment I strongly supported. Bush has been worse by far than any other post war President in his defiance of the legislative authority of the people and the illegal immigration problem has grown incalculably worse during his term both because of his amnesty rhetoric which has encouraged a flood of illegal immigration and his actions to shut down enforcement which extend so far as intimidation of our border control officers (Ramos and Campion) and the signing of secret pacts with Mexico.
If we wish to be serious about asserting our rights as citizens to govern ourselves and shape our own future for ourselves and our children, such Presidential actions and attitudes must be met with determined resolve. If "we the people" will not even assert the threat of impeachment under these conditions then we really do deserve the government we've got!