But the most pressing concern for many Republican presidential contenders as they prepare for the first debate of the 2016 primary season is one man: Donald Trump
Rick Santorum, one of the many 2016 GOP presidential hopefuls, stopped by to speak with MSNBC's Rachel Maddow Wednesday night and went to battle with the out anchorwoman over LGBT rights.
Republican presidential candidate Donald Trump's visit to the U.S.-Mexico border promises new challenges for the GOP's years-in-the-making push to attract Hispanic voters.
Federal election regulators released new details Wednesday about Republican presidential candidate and celebrity businessman Donald Trump's wealth and financial holdings, weeks after he estimated his net worth at roughly $10 billion.
Barack Obama shifted from baseball to football to analogize the limitations of meeting his goals as president during an appearance on "The Daily Show" Tuesday.
Hillary Rodham Clinton's economic agenda targets companies that focus on short-term profits and high-speed trading instead of investing in workers. Her finance operation is going after their executives for another purpose - donations.
Republican presidential candidate Donald Trump has pulled a classic adolescent prank on a rival who dared to criticize him, a bit of payback reminiscent of writing the phone number of a nemesis on a wall with the message "Call me."
President Barack Obama speaks to a veterans' convention, then tapes an appearance with Jon Stewart of "The Daily Show" on Tuesday as concerns run high about Iran, veterans' care and a shooting rampage against U.S. Marines.
Ohio's John Kasich, a blunt governor who embraces conservative ideals but disdains the political sport of bashing Hillary Rodham Clinton, is to become the 16th notable Republican to enter the 2016 presidential race.
The Republican establishment may hope this is the beginning of the end for Donald Trump's circus-like run for the presidency.