1. The economy, may be dipping but should recover in time, Trumps tariffs are very popular with his base. 2. Weakness of the DNC candidate, looks like Joe Biden who comes across as a doddering and slightly handsy old uncle, there just isn't the charismatic Bill Clinton/Barack Obama figure to inspire DNC voters. 3. The excesses of the left wing scaring away floating voters, every time the 'Squad' open their mouths they alienate vast swathes of the electorate. 4. Demographics/electoral college, the DNC win cities by big margins but loses the rural voters and the states due to electoral college. 5. Other?