Liberal Position
Under Bush and Obama/Biden, they slowly raised corporate taxes which resulted in a larger number of companies leaving the U.S. to go overseas. With lower taxes overseas Companies can hire cheaper labor, pay lower taxes and keep more of their profits. This had a negative effect on the economy and jobs. This resulted in the rich people getting richer and the poor and middle class people being stuck in jobs that had low or no growth, creating an ever widening income gap.
The reason the jobs and the economy did not bounce back under Obama was because there were no incentives for Companies to stay in America. Without employers to hire the workers, it would be expected that jobs would not rebound, and as a result, the number of unemployed people remained high. While the unemployment rate fell under Obama/Biden it was in large part due to people that had given up and left the work force, and they were no longer eligible to receive unemployment benefits. The labor participation rate decreased under Obama (see Boston Herald Article).
Obama did not seem to understand that when he said that "those jobs are gone and they are not coming back." He even quipped that Trump did not have a "Magic wand" to get those jobs back, indicating that he did not understand this concept. See his speech on PBS.
In 2016, Liberal political pundits warned that if Trump were to be elected, the economy would tank, unemployment would skyrocket and the stock market would crash. They were wrong.
Joe Biden Promises to remove the Tax cuts that led the strong economy.