Barack Obama won the presidential election in 2008 because American voters were weary of the war in Iraq and traumatized by the onset of the Great Recession in 2008.
So, who did Jeb Bush select for his foreign and economic policy advisers?
Look above at his foreign policy advisers. Twenty of these 21 distinguished individuals were connected to teams of his father and brother. The average Republican voter could reasonably assume that a third Bush presidency would result in the same foreign policy that destabilized the Middle East in the search for the Holy Grail of democracy, costing the United States over $2 trillion, thousands of casualties, with Iran emerging as perhaps the big winner.
Now look at his economic advisers. Only two prominent persons were officially announced, with two others contributing to Jeb's tax policy proposal. The average voter could reasonably assume that those who advised or served in his older brother's administration were not likely to achieve economic success in a Jeb Bush administration.
No new young fresh faces played a prominent role in Jeb's policy teams. To Republican primary voters and caucus goers, it was a case of "same old, same old." Small wonder that Republican voters were attracted to something new in Donald Trump, Marco Rubio, and Ted Cruz.