It's fairly clear to just about everyone that Barack Obama is now in the lead, if only by a slim margin. The thing is, with the allotment of delegates being proportional, that slim margin will be especially difficult for Hillary to overcome. This is also fairly clear to many of us.

So, in the coming days, weeks and maybe even months, Obama absolutely must be careful; he and his campaign must not fall into a habit of being the frontrunner. They cannot get lazy now, sure of their position and the likelihood that Hillary will be unable to retake the delegate lead before the convention (where there will be serious hell to pay if the superdelegates defy the will of the people and nominate Hillary... I hope, at least)

In short, Obama and (especially) his campaign cannot slip up. They cannot afford anything that would potentially cause them to lose votes due to sloppiness resulting from the excitement of being ahead. The campaign has all but solidified Obama's place as the nominee, provided they can continue doing what they have been doing: running a silky smooth campaign perhaps completely free of trip-ups and "gaffes". The campaign is already racking up big-time support, and I wager it will continue on in this fashion, again, provided they don't take their eye off the ball, already convinced they're going to hit a homerun (I love sports analogies, they just work in so many arenas of life).

They almost cannot afford a single solitary mistake, because Hillary, while she may be that out-dated politician who will win at all costs, is especially dangerous to Obama precisely because of that: she will exploit any and all openings in the seams of Obama's performance and rent him asunder at the first sign of a major error.

Obama has the media, he has the majority (albeit slim) of the nation (thus far) behind him, he has the polls behind him in the theoretical match-ups with McCain and he is beginning to receive exactly the support he needs to give him that extra push to the nomination. So the only thing he really needs to do at this point is not mess things up.