Is Donald Trump Obama's real legacy?

Who is the most divisive figure in American politics, Donald Trump or Barack Obama? It's the question at the heart of the 2016 presidential race.

As Trump's campaign rallies increasingly degenerate into fisticuffs, fingers are pointing over who's to blame. One rally participant sucker punched an African-American protestor. The billionaire's big Chicago event before the Illinois primary was canceled due to security concerns.

Trump clearly bears some responsibility for encouraging an atmosphere at his campaign events that resembles professional wrestling more closely than presidential politics. Shouting down protestors and sometimes removing them by force has become a major part of his shtick on the stump. "Get 'em out of here," Trump says from the podium as the offenders are escorted out of the venue by security. He has favorably compared his strength in dealing with protests to the weakness of presidential candidates such as Bernie Sanders.

The people who disrupt campaign events are also responsible for their actions. Since many have been Bernie Sanders supporters, the Vermont senator has had to deny having anything to do with the chaos. "Obviously, while I appreciate that we had supporters at Trump's rally in Chicago, our campaign did not organize the protests," Sanders said. "What caused the protests at Trump's rally is a candidate that has promoted hatred and division against Latinos, Muslims, women and people with disabilities, and his birther attacks against the legitimacy of President Obama."

The Republican establishment can't be let off the hook. Despite promising every two-four years that the country faces the most important election in its history, long-term conservative goals on abortion, school prayer, the size of the federal government and securing the border remain unrealized. Even more recent innovations, ranging from Obamacare to the administration's executive actions, feel permanent. Rank-and-file conservatives feel their elected officials always lose their fights with the White House.