DES MOINES, Iowa — Vice President JD Vance made a marathon campaign swing to three states Tuesday to haul in cash, buzz and votes for Republican candidates ahead of the midterm elections. Vance, 41, made the packed day-trip about six months before the general election, joined by his 6-year-old son Vivek . Leaving DC around dawn, Vance voted in the Republican primary in-person down the street from his Cincinnati home in Ohio before rousing donors at a lunch in Oklahoma City and then closing out his day at a rally for Republican candidates in Iowa. Vice President JD Vance visited three states Tuesday to boost Republicans in the midterm elections. AP “I’m here today to talk a little bit about the stakes in November of 2026,” Vance told about 500 people at a Des Moines manufacturing facility located in the swing district of incumbent Republican Rep. Zach Dunn, whose race could help tip the balance of control in the House.…