The withdrawal of Joe Biden from the presidential race three weeks after his disastrous debate performance, followed by the swift decision by Democrats to select Kamala Harris as the presumptive nominee, leaves us in uncharted waters. According to veteran political strategist Doug Sosnik, the broad contours of the 2024 election remain: “It’s a narrowly divided country. It’s a fairly even race. But Trump has the advantage in an Electoral College system that [today] favors Republicans.” Yet this election has been like no other. In this Conversation, Sosnik shares his analysis and practical advice for the next four weeks and the next four months. Sosnik explains why the next month may prove decisive. Each campaign now is racing to define Harris, and the stakes of the Democratic convention in August are higher than they have been in many decades. In the weeks ahead, Harris faces the daunting challenge of both running on strengths of the Biden-Harris record and presenting a case for the future that is her own—all as she decides on the most effective case to prosecute against Trump. This will not take place in a vacuum. At the same time, Harris will face an onslaught from the Trump campaign, which has done little advertising during the past weeks and has a war chest to spend on defining her. Sosnik warns that, to win, it is essential for Harris to avoid the peril of presidential candidates like Mitt Romney, John Kerry, and Bob Dole, who have allowed their opponents to define them before their nominations. As Sosnik puts it: “Success always begets more success in politics. So the more successful she is at consolidating the party, demonstrating her capacity to be the nominee, the more successful she is on the run-up to the convention, the more likely the convention is to be a success.” To that end, he argues that Harris's decisions over the next weeks—about her campaign staff, defining her vision, organizing a successful Democratic convention, selecting a strong vice-presidential candidate, etc.—likely will determine her prospects in November.