FLORIDA, WITH ITS 30 electoral-college votes—more than any other state apart from California and Texas—has for some time appeared to be a lock for Republicans. But some Florida Democrats insist that the newly upended presidential race has given them a chance of victory there. Kamala Harris, simply by not being Joe Biden, has injected a jolt of energy into the contest. Democrats in Florida are now trying to convert that excitement into something tangible: thousands of volunteers to get out the vote for the Harris campaign.