Twice as many bettors are backing Trump over Biden, according to British betting firm Smarkets. : According to British betting firm Smarkets, twice as many bettors are backing President Trump to win on Tuesday, despite odds that say that his opponent, former Vice President Joe Biden will clinch the general election. The Smarkets betting market has ballooned to $14.7 million, with Biden favored to win at nearly 66%. Trump’s odds currently sit just over 33%. But how could twice as many bettors back Trump, and Biden still be favored to win with nearly two-thirds odds?