WILMINGTON, Del. (Reuters) – U.S. President Joe Biden will cast an early vote in the crucial Nov 8 midterm elections on Saturday, joined by his granddaughter Natalie, a first-time voter, as Democrats fight for every vote. Polls suggest Democrats could lose control of both houses of Congress, with voter discontent over high inflation spoiling the momentum Democrats had hoped to win from a bitter fight with Repubicans over abortion rights. Voter turnout – usually far lower in midterm elections than in presidential ballot years – will be a critical factor in battleground states, and Democrats are…