After February Sen. Obama led Sen. Clinton by almost 150 pledged delegates. Given the states remaining, various "best case scenarios" offered by Chris Bowers and others had Clinton narrowing that to about 100 by June 3. She didn't do that but did pretty well. As of now, DCW has Sen. Obama holding a 126 pledged delegate lead over Sen. Clinton. Here's a quick recap:
January (-MI/FL): Obama 63, Clinton 48
Super Tuesday: Obama 847, Clinton 834
Rest of Feb.: Obama 287.5, Clinton 166.5
March: Obama 210, Clinton 205
April-June: Obama 262, Clinton 304
Clinton finished strong which most of the aforementioned scenarios predicted given pro-Clinton states such as Penn., WV, Kentucky and Puerto Rico. She came up short in March (OH, RI, TX, etc.) but even larger margins there would only have narrowed the final deficit to about 100.
Delegate-wise, Sen. Obama won the race by essentially tying Sen. Clinton on Super Duper Tuesday (can we go back to just regular-sized Super Tuesdays or smaller?) and then going on his "rest of Feb. run." 121 of his 126 pledged delegate margin occured in this period. And incidentally, only 4 of those 11 contests were caucuses which benefitted Obama by a margin of +48. The other +73 pledged delegates in this period came from primary states.
For those of us following the math, this long March-June period has been tough because the final result was (almost) preordained by Jan-Feb. results. But now it is over.