25w100k+, first of all, please forgive the slow response. Though your question was simple, a proper answer is complex. I simply didn't have the time last night to respond adequately.
First of all, you are mis-characterizing the Republican platform. If you read the platform to see what Republicans are SUPPOSED to be about, you will find that the party believes in free markets, small government, and low taxes. Of course a simple look at what happened between 2003 and 2007 reveals that anything but small government wasn't in force. Good things and bad things happen in any administration, but without a doubt one of the worst things that happened during the Bush administration was the growth in Federal spending.
Has the party policy changed? Absolutely not. But unfortunately as parties gain power, people more interested riding the coat tails of the party than in the policies that led to the gains in power begin to join the party. This dilutes the purity of the political belief system that creates parties. It should be noted that a complete change in beliefs isn't required to change the outcome of a party. The majority in the House and Senate that the Republicans had between 2003 and 2007 was narrow. It doesn't take many Republicans to cross the philosophical line and join the tax and spend liberals for government spending to grow. And while President Bush has the right vision on national security and taxes, he never was a believer in small government. Not only did he pass spending bills that should have been vetoed, but he even committed sins such as lobbying Congress for the prescription drug bill.
The official position of the Republican Party is small government. If that fits your belief system, then you need to be active in supporting candidates at local and Federal levels in both the primaries and the general election that share your belief system. If you believe in large government and high taxes, then maybe you should consider moving to Europe.
(Just kidding, but not really!)
But since we are on the subject of taxes, it's probably worth sharing something that I read a few months back. I could probably find the original article with some searching, or you could easily take this factoid, run it against numbers that are very public, and see for yourself. Since the end of World War II, the highest Federal tax rate in this country was 70%, the lowest top tax rate in this country was 28%. During that time we have had robust expansions, recessions and flat economies. But despite a wide range in tax rates and economic activities, Federal income tax collections during that time have always been with a couple of tenths of a percent of 19%.
Higher tax rates don't increase Federal revenues. Even though the Federal government is taking a larger share of your income, the reduction in economic activity offsets the higher rates.
If our government needs more tax money, the only effective way to get it is to grow the economy.
Lower taxes are the best way to do that.