After the speech:
March 19, "Obama now leads Clinton 47% to 42%. Yesterday, Obama led 45% to 44%"
http://rasmussenreports.com/public_content/politics/election_20082/2008_presidential_election/daily_presidential_tracking_poll

Clearly the attack on the pastor has hurt Obama. The jury is still out on the effect of the speech.

Either you're too prejudiced or too ignorant to see the whole picture.