FT.com – unlocked: “Kamala Harris and Donald Trump will meet face to face for the first time on Tuesday as they take the stage for the US presidential debate. Harris has upended the race since she replaced President Joe Biden at the top of the Democratic ticket in July, revitalising her party’s campaign. But while the vice-president is now ahead of Trump by 2.9 percentage points nationally, according to the Financial Times’ poll tracker, her lead has narrowed slightly in recent days and the presidential race remains extremely tight. Here are five things to watch for when the candidates meet at 9pm ET in Philadelphia.”