Primaries. this man is going to win. reporter: as pence quietly focuses on smaller party-unifying efforts. we gather together with a sense of optimism and purpose. reporter: a tenor distinctly different than his former running mate. right now, our country is going to hell. reporter: trump continuing to litigate the past. our biggest threat remains the sick, sinister, and evil people from within our own country. reporter: the one-time duo now on separate but potentially colliding campaign trails. donald trump engages in so many of these contentious primaries, putting his political capital on the line. vice president pence doesn t wade into the inter-party fights. instead, is in iowa joining chuck grassley, endorsing hinson for congress in her re-election bid, trying to stay back as donald trump potentially puts his own self on the line and makes himself vulnerable in some of these races. you saw there, vaughan, we