Many Americans expect bitterness and mistrust between Democrats and Republicans on Election Day. Here’s something they won’t expect: hundreds of everyday liberals and conservatives pairing off at polling places nationwide to try to show voters — and themselves — that whoever wins, our union can’t lose. What’s motivating these Trump and Harris voters to stand side-by-side in front of anxious voters Nov. 5? We talk to pairs in a red state, a blue state, and a swing state to find out.