A strange quirk of Nebraska's constitution essentially gives Omaha -- the state’s largest city -- its own distinct and powerful vote for the next US president. In the far-from-impossible scenario that Kamala Harris and Donald Trump are tied in the Electoral College that determines the White House's next occupant, this tiny Democratic-leaning "blue dot" of 650,000 people could have the final say. Jason and Ruth Brown have distributed thousands of hand-made lawn signs bearing simple blue dots to homes across Omaha, wordlessly reminding neighbors that this progressive island can tip the balance against Trump. Last month, Republicans mounted a major effort to change Nebraska to a winner-takes-all system, but the bid failed, and Democratic state senator John Cavanaugh believes it has now backfired on Republicans. "You've seen an exponential increase in energy as a result of the attempt to take away our vote," he says. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES