In the fourth episode, RealClear’s polling analyst David Byler asked Dartmouth College political scientist Brendan Nyhan why voters cling to myths and misconceptions during elections. RealClearPolitics White House Correspondent Alexis Simendinger asked Professor Kathleen Hall Jamieson, director of the University of Pennsylvania’s Annenberg Public Policy Center, whether Hillary Clinton or Donald Trump could lock up wavering voters in 90 televised minutes. Managing Editor Emily Goodin, with help from Franklin and Marshall College polling director G. Terry Madonna, explains how four of Pennsylvania’s 67 counties could decide whether Clinton or Trump capture the state’s prized 20 Electoral College votes.

In the third episode, polling analyst David Byler examines the national numbers race with help from the Cook Report’s David Wasserman. And national political correspondent Rebecca Berg explains why North Carolinians are getting so much attention from the presidential nominees when she speaks with former North Carolina Sen. Kay Hagan and Rebecca Tippett, director of Carolina Demography at the Carolina Population Center at the University of North Carolina-Chapel Hill.

In the second episode, RealClearPolitics’ polling expert David Byler talked numbers with Kyle Kondik of Larry Sabato’s “Crystal Ball”; congressional correspondent James Arkin interviewed Kevin McGlaughlin, deputy executive director of the National Republican Senatorial Committee; Bureau Chief Carl Cannon interviewed Republican campaign adviser Roger Stone; and correspondent Alexis Simendinger talked with Tampa Mayor Bob Buckhorn.

The inaugural edition of “In the Arena” features RealClearPolitics’ polling experts David Byler and Sean Trende discussing the numbers race, RCP co-founder and publisher Tom Bevan speaking with Republican National Committee chief strategist Sean Spicer; and reporters Caitlin Huey-Burns and James Arkin setting the scene in Ohio, a state considered a must-win bellwether in modern-day presidential contests.

As the primary season transitions into the general election, the parties converge on their conventions to settle final differences and rally around the nominee. RCP discusses with Kyle Downey, press secretary to the 2012 GOP convention.

Trailhead - Episode 8: Running Mates by RealClearPolitics

Candidates often attack the press - but they also rely on them to get their message out during a primary. RCP talks with Jason Noble, chief political reporter for the Des Moines Register; and Sasha Issenberg, reporter for Bloomberg Politics and author of "The Victory Lab."

Behind the candidate and behind the scenes, vast teams make the campaign work. RCP discusses with Doug Stafford, former chief strategist for Rand Paul; and Lanhee Chen, a former policy adviser to Marco Rubio.

For character witnesses in a presidential primary, candidates turn to a cast of elected officials and other prominent supporters to vouch for their bona fides. But a good surrogate can be hard to find. RCP discusses with Rep. Jeff Duncan, a South Carolina Republican, who campaigned on behalf of Ted Cruz.

Glistening wheat fields, fluttering American flags, young children on a playground: Campaign ads can be formulaic — but they aren’t always. RCP discusses with Liz Mair of Make America Awesome PAC; and Will Ritter, Poolhouse co-founder and former Marco Rubio media consultant.