Karen Tumulty, Dan Merica and Yasmeen Abutaleb
(Gaby Velasquez/ El Paso Times/GABY VELASQUEZ/ EL PASO TIMES / USA TODAY NETWORK via Imagn Images)
A 21st-century-record number of seats are opening, and races will be raucous and crowded, reflecting both parties’ ideological, stylistic and generational tensions.
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