Why do we elect Republicans?

I am reminded of a quote from Bob Novak, which I'll paraphrase: "Republicans were put on earth to cut taxes and spending, and if they're not going to do that, why elect them?" This comes to mind in light of Congresses and President Bush's profligate spending the past few months. Examples are the pork ridden farm and highway bill, and now an 'economic Marshall Plan" for the areas stricken by hurricane Katrina. I have seen any sincere effort by the Republican leadership, whether it be in Congress or the White House -to detail any offsets that will fun the disaster recovery plan.

This is reminding me of the Mulroney government of the 80's - they had a huge mandate to cut spending and taxes and did neither. At least I'll give the Republicans credit for getting it half right. However, if they don't start reigning in spending and start paring back the scope of government, a lot of conservatives will start wondering aloud that if they wanted big government spending, they'd elect Democrats.