As the pair faces off in a high-stakes 11th Democratic debate on Sunday
The showdown in Las Vegas marks one of the most contentious debates so far
Communications blockade in IOK must end immediately, US must boldly support UN-backed resolution: Bernie Sanders
Sanders also will face lingering resentment in some Democratic quarters over the 2016 presidential campaign
Sanders also successfully pushed to include an array of liberal policy positions in the Democratic Party platform
Other prospective running mates include US Labor Secretary Tom Perez and US Housing Secretary Julián Castro
Obama also spoke to Democratic presidential candidate Bernie Sanders
Clinton and Trump are all but assured to be the Democratic and Republican party nominees
Sanders, a self-declared democratic socialist, declared he would not be forced out of the race by narrow Clinton wins
Clinton sees Kentucky as an opportunity to appeal to a demographic that has consistently snubbed her