1) Guliani (the presumptive Republican nominee) has all manner of sleazy doings waiting to be uncovered. You can bet Democratic opposition research knows about all of it, and will slime him when the time is right. Plus, his dealings will make anything uncovered on Hillary look mild by comparison.
2) The US citizenry requires presidential candidates show they can throw a punch. Hillary will amply demonstrate she can throw knock-out blows.
3) Her husband is the best political strategist in the Democratic Party, maybe in the country.
4) The economy and the war will hurt the already demoralized Republicans even more.
Note that none of this has anything to do with her platform, but then when did that matter in our money and media fueled presidential campaigns?