Bringing morality back to the oval office, cutting taxes, and fighting terrorism. Clinton whereas brought shame to the oval office, hiked taxes (the largest tax hike in US history), and did very very little about terrorism. Most people dont want to change horses during wartime either.
Clinton actually came close to killing Osama, i think the missile arrived 90 minutes late. Its much Closer than dubya's done. Although we may very likely capture or kill osama this year, but so far dubya hasn't got close.
Clinton presided over the greatest economy in modern US history. If you look at the lowest employment rate that certain states have ever had you see that many have '99 , '00 or early '01 as the lowest unemployment rates in their modern history. His tax hike allowed a balanced budget.
Dubya is doing much obscene spending, with a half trillion dollar deficit. Its either pay now , or pay twice as much through interest over the years. Thanks to the Vietnam war and Reagan and now Bush roughly 1/6 (estimation on my part I can't remember the actually fraction) of the federal government's expenditures are to paying off the national debt.
So Clinton lied about getting a Blow Job from an relatively unattractive girl, hell most guys would lie about that too. Clinton's lies hurt basically only himself and Hillary. Dubya's lies about Iraq has cost the US its credibility abroad .
A vote for Bush is a vote to increase the National Debt over 9 trillion (1.5 trillion his next term, and .5 trillion for someone to bring it under control), and increase hatred for the US the world over, among other bad things.