Jon Lieber, Eurasia Group's head of research and managing director for the firm's coverage of United States political and policy developments, shares his perspective on US politics from Washington, DC.

What we're watching in US Politics: Kamala Harris is off to a blazing start since replacing Joe Biden as the Democrats' pick for the presidential race, raking in almost $250 million in just one week. The big question: Can she maintain this momentum in the race against Donald Trump?

Joe Biden drops out of the race last Sunday, unexpectedly, as the oldest candidate ever, instantly making Donald Trump the new oldest nominee in American presidential history. Now he's going to have to run against a Democrat who's 19 years younger than he is, and the sitting Vice President of the United States, Kamala Harris. She's off to a scorching hot start raising almost $250 million, a quarter of a billion dollars in a single week since Biden announced he was dropping out, and she's picking up a lot of buzz and excitement online.