Here are some quotes from an ACADEMIC source on the mythology of supply-side:

"During the 1950s, corporations paid about one-third of all income taxes collected by the government. Consequently, the tax burden on workers was relatively low. For example, the tax burden of a median-income worker household was only 10 percent in 1950 and 13 percent in 1959...In 1963 Kennedy slashed taxes on wealthy households and corporations...Workers did not immediately object to this redistribution of tax burden because unemployment was low and wages were rising rapidly, doubling between 1950 and 1970. Rising wages increased workers' ability to pay taxes, and this increased tax revenue" (Dickinson 142). 

Which is totally different from today, as Obama mentioned, real incomes for workers are actually lower today than they were at the begining of Bush's term. Ergo, the Bush tax cuts did not "trickle-down" to the working classes. Therefore, workers are losing, and Americans are experiencing a massive redistribution of income (this is only logical). How can we prove this? The GINI index, which measures income inequality in a country.

1980 (Reagan):34.7

1988 (End of Reagan's term):38.4

2001 (Bush): 46.3

2004: 46.4

Sources: US Census Bureau web 2/2005/Brandolini 1998

For a definition of the index: https://www.cia.gov/library /publications/the-world-fac tbook/docs/notesanddefs.htm l#2172

Proof that this regressive tax policy is done to redistribute wealth and buy off the poor:

"Reagan's budget director, explained, small tax cuts for worker-taxpayers enabled conservatives to pass large tax cuts for the rich: '[Small tax cuts] were always a Trojan horse to bring down the top rates' " (Dickinson 144). 

So if you are a worker, and a Republican you are either a complete fool, or completely ignorant. 

Source:

Dickinson, Torry D. and Robert K. Schaeffer. Fast Forward: Work, Gender, and Protest in a Changing World. Maryland: Rowman & Littlefield Publishers Inc.