Trump is easy to beat. Its just that the democrats choose the worst candidates.
Hillary? very unlikeable, got cheated on publically by a former president husband and thinks she is better then everyone
Joe Biden? Old, senile and has a terrible track record.
They could literally be on some "head of state" type of time and pick a young charismatic guy who focuses on the living wage, housing, education(college debt) and win. The problem is that they are more concerned with their donors and backers then they are the people. Ol heads who don't know when to quit.
Hillary is/was popular with Democrats it's Republicans that hated her.
Biden's track record was fine for a Democrat in 2008 and 2012 it's only in 2016 that people decided that those votes were all disqualifying.