Pennsylvania’s primary will cement Casey, McCormick as nominees in a battleground US Senate race [Video]

HARRISBURG, Pa. (AP) — Tuesday’s Pennsylvania primaries will cement the lineup for a high-stakes U.S. Senate race between Democratic Sen. Bob Casey and Republican challenger David McCormick, a contest that is expected to cost hundreds of millions of dollars and could help decide control of the Senate next year.

Casey, seeking his fourth term, is perhaps Pennsylvania’s best-known politician and a stalwart of the presidential swing state’s Democratic Party — the son of a former two-term governor and Pennsylvania’s longest-ever serving Democrat in the Senate.