He also said Trump should learn "to put yourself in outher people's shoes."
Saturday's caucuses could award Sanders an eighth victory out of the past nine contests.
The poll shows Trump with a double-digit lead over his closest rival.
Ben Carson, a surrogate for Donald Trump, said that Republican presidential front-runner's tweets have been a problem and that Trump recognizes it.
In a radio interview with Joyce Kaufman that was first reported by...
Vicki Needham 04/08/16 02:34 PM EDT
Former Treasury Secretary Henry Paulson doesn't expect a Trump presidency.
Ted Cruz’s “New York values” insult isn’t going down well with the city’s residents.
This was the best fundraising month for the Texas senator.
Attendees reportedly included actresses Julia Louis-Dreyfus and Julia Roberts.
The former congresswoman said Clinton had a "tough time."