Congresswoman Maxine Waters
President Barack Obama has a wealth of political capital and now he has begun to spend it on Capitol Hill. His recent speech to the US Congress in support of his healthcare reform plan was a clear sign that he knows that his credibility as a leader and an agent of change is on the line. Can the President impose his will not just on Congress but on the American public? Congresswoman Maxine Waters is an influential voice on the left of the Democratic party - she talks to Stephen Sackur.