Hillary Clinton gave an excellent speech, too, making it more clear than she usually does how her election as President would be revolutionary, too, by putting a woman in the White House. This is something she'll need to do more of, if she stands any chance of getting the nomination.
Clinton's speech was, indeed, less political than Obama's - but political is just what Obama needs to do now. He has to convince as many Democrats as possible that he can beat the 19th-century Republicans who are running for the highest office.
Obama certainly won by overwhelming margins tonight in Louisiana, Nebraska, and Washington State (and, just for good measure, in the Virgin Islands, too). The delegate count is still close, and there are some crucially important primaries ahead, but Obama is gaining an edge.