Why on a Saturday?

That was my thought yesterday when the news came out that Hillary had tossed her hat in the ring for '08. Does her campaign not want the full glare of the white hot spotlight? And if this announcement was planned (as hypothesized) to overshadow Barack Obama, then don't all of the other Democratic candidates stand to gain from Hillary and Obama going toe to toe for the next year? It would seem one savvy politician amongst 'the rest' would be able to position themselves to take advantage of a weakened Hillary & Obama come next year.