The Latest: Sanders more subdued after NY defeat
Southern primaries account for a considerable portion of Clinton's national lead in pledged delegates and the popular vote.
Former Democratic National Committee Chairman Don Fowler of South Carolina, among others, penned a letter this week to the Vermont senator noting the region's racial diversity accurately reflects the national Democratic coalition.
Trump's advisers have cast the policy speeches as part of a campaign evolution that has included hiring staff with more experience in presidential politics.
Republican presidential candidate Ted Cruz is set to meet with Indiana Gov. Mike Pence ahead of his appearance at a state GOP fundraising dinner in Indianapolis.
Pence's office says the two will have a private meeting Thursday afternoon at the Governor's Residence, a day after the Republican governor had a similar meeting with Donald Trump.
Cruz also has an afternoon campaign stop scheduled for a downtown Indianapolis restaurant before Thursday evening's Republican Party dinner, where tickets cost $150 each and up.
The Republican presidential front-runner calls it an act of "pure political correctness."
Speaking at a town hall event on NBC's "Today" Thursday, Trump said North Carolina's so-called "bathroom law," which directs transgender people to use the bathroom that matches the gender on their birth certificates, has caused unnecessary strife.
The wife of the Republican presidential front-runner offered the response while speaking on NBC's "Today" ahead of a town hall event taking place in midtown Manhattan.
The messy fight for the Republican presidential nomination is shifting to a luxury seaside resort in south Florida as Donald Trump and chief rival Ted Cruz quietly court party leaders ahead of another set of high-stakes delegate contests.
Campaigning in Indiana on Wednesday, Trump railed against his party's leadership, even as his senior lieutenants courted GOP officials in Florida.
Trump and the Democratic front-runner, Hillary Clinton, are pushing ahead toward Northeast primaries on an increasingly direct path to their party's nomination after trouncing their opponents in New York's primary.