Doug Bandow, former special assistant to President Reagan, current senior fellow of the Cato institute says this:

Those who still believe in Bush have tried to play up comparisons with Ronald Reagan, but I knew Reagan and he was no George W. Bush. It's not just that Reagan read widely, thought deeply about issues and wrote prolifically. He really believed in the primacy of individual liberty and of limited, constitutional government.

In his farewell address to the nation on Jan. 11, 1989, Reagan observed: "I wasn't a great communicator, but I communicated great things." Even when politics forced him to give way, everyone knew what he stood for. Bush's biggest problem, in contrast, is not that he is a poor communicator. It is that he has nothing to communicate. Victory over terrorists, yes -- but then what American really disagrees with that goal? Beyond that there is nothing.

"Government should never try to control or dominate the lives of our citizens," Bush says. But you wouldn't know that from his policies. He has expanded government power, increased federal spending, initiated an unnecessary war, engaged in global social engineering and undercut executive accountability. This is a bill of particulars that could be laid on Lyndon Johnson's grave. No wonder "Republicans aren't very enthusiastic about" Bush, says right-wing syndicated columnist Robert Novak.

Although anecdotal evidence of conservative disaffection with Bush is common -- for instance, my Pentagon employee neighbor, a business lobbyist friend, even my retired career Air Force father -- for many the thought of voting for John Kerry remains simply too horrific to contemplate. And this dissatisfaction has yet to show up in polls. Fear of Kerry, more than love of Bush, holds many conservatives behind the GOP.

Yet serious conservatives must fear for the country if Bush is reelected. Is Kerry really likely to initiate more unnecessary wars, threaten more civil liberties and waste more tax dollars? In any case, there are other choices (e.g., the Libertarian Party's Michael Badnarik, the Constitution Party's Michael Peroutka and even Independent Ralph Nader).

Serious conservatives should deny their votes to Bush. "When it comes to choosing a president, results matter," the president says. So true. A Kerry victory would likely be bad for the cause of individual liberty and limited government. But based on the results of his presidency, a Bush victory would be catastrophic. Conservatives should choose principle over power.

The full op-ed piece, which is very long and detailed, is here