The vice-presidential candidates' debate

Mike Pence and Tim Kaine surprised the prognosticators in last night's vice presidential debate, introducing themselves to the voting public with a lively set of exchanges. Will it make any difference in the presidential campaign?

This year's vice presidential candidates were limited to just one debate in the campaign for the White House. They are both experienced political pros: former Congressman Mike Pence, now Republican Governor of Indiana, and Tim Kaine, former Democratic Governor of Virginia, now in the US Senate. David Weigel, who is covering the vice presidential nominees for the Washington Post, has an analysis.