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Dr. John Lapinski

Dr. John Lapinski

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Dr. John Lapinski

Republican presidential hopefuls Ben Carson and Donald Trump high five during the second Republican Presidential Debate held at the Ronald Reagan Presidential Library in Simi Valley, Calif. on Sept. 16, 2015. (Photo by Frederic J. Brown/AFP/Getty)

Poll: Carson and Trump lead the GOP field, Cruz gets a bump

Democratic presidential candidate Hillary Clinton speaks at the Community Forum on Substance Abuse at The Boys and Girls Club of America campaign event in Laconia, N.H., Sept. 17, 2015. (Photo by Faith Ninivaggi/Reuters)

Hillary Clinton’s lead narrows: NBC online survey

U.S. Republican presidential candidate and former CEO Carly Fiorina pauses while speaking during the Heritage Action for America presidential candidate forum in Greenville, S.C. on Sept. 18, 2015. (Photo by Chris Keane/Reuters)

Poll: Carly Fiorina prevails in second debate, Trump still leads GOP

Republican Presidential candidate Donald Trump addresses supporters during a political rally at the Phoenix Convention Center on July 11, 2015 in Phoenix, Ariz. (Photo by Charlie Leight/Getty)

The deep dive: Who supports Donald Trump?

Democrats split on whether Joe Biden should enter 2016 race

Post-debate polls finds Trump still leading pack, Carly Fiorina winner of debates

Republican Presidential candidate and business mogul Donald Trump talks to media from his car wearing a, "Make America Great Again," hat during his trip to the border on July 23, 2015 in Laredo, Texas. (Photo by Matthew Busch/Getty)

The deep dive: Where Republican candidates are drawing support

President Barack Obama arrives to speak at a news conference at the G-7 summit in Schloss Elmau hotel near Garmisch-Partenkirchen, southern Germany, June 8, 2015. (Photo by Carolyn Kaster/AP)

Why Obama’s trade proposal is a tough sell: Americans want to protect jobs

People walk at Grand Central Terminal, New York, NY. (Photo Illustration by Justin Maxon for MSNBC)

Americans divided on government surveillance

A journalist looks at Vanity Fair's Twitter site with the Tweet about Caitlyn Jenner, who will be featured on the July cover of the magazine. (Photo by Mladen Antonov/AFP/Getty)

Americans say Caitlyn Jenner’s public transition will boost acceptance