Harris’ momentum is growing. Our polling expert explains whether it’ll last.  POLITICOInside the fast-moving launch of Kamala Harris for president  CNNKamala Harris has the momentum. Now comes the real test  Financial TimesThe evolution of Kamala Harris: from activist in pigtails to presidential candidate  The Guardian USOpinion | Harris can seal the deal this week by being new, improved — and loyal  The Washington Post