I wouldn't support any senator except those who were former governors for President in 2008. Only two sitting US Senators have ever been elected President of the US. Kerry will not be the third. Traditionally governors of medium to large states have tended to be the most successful candidates. The presidency is an executive position like a governorship not a legislative position like a Senate or House seat. I think Mitt Romney would be in a strong position to run in 2008. He is a conservative governor who has been elected in the most "liberal" state in the US. I think he may be able to hold on to the states Bush carried in 2000 and is going to carry in 2004 while improving Republican chances in northeastern states where the GOP has been weakest in recent presidential elections.