Depends on what you mean by "having nominees". Will any candidate from either party have clinched the nomination in the sense that they'll already have won a majority of delegates? Almost certainly not. Will one candidate have won decisively enough on Feb. 5th, such that it's blazingly obvious that they will eventually clinch the nomination officially and be the nominee (such that, say, Intrade will give them a >90% probability of winning the nomination)? Probably yes, for both parties. I've explained why I think that's the case in other threads in the last week or so, but I can lay it out in detail again if you like.
so you think that is Obama wins 3-4 states, including Illinois and Californiaand Nevada, while Hillary wins Florida, NY and NJ and most of the other states, Obama's done. Or Hillary's done. Or do you just think that one of the 2 will win more decisively than that... in other words, if Obama wins SC and Nevada, he'll cruise to victory in the majority of Feb 5 states, or if Hillary wins Nevada, she'll do the same, either way leading to a presumptive nominee at that point.