The lieutenant governor and the top elections official, both Republicans, are investigating whether the challenger coordinated with a Democrat to confuse voters.
Republicans argue that the Senate campaign by Dan J. Sullivan, right, was planned by Democrats to confuse voters and hurt Senator Dan S. Sullivan, left, a second-term lawmaker.
Randy Villegas, a progressive backed by Senator Bernie Sanders of Vermont, defeated Dr. Jasmeet Bains in the Democratic primary in California’s 22nd Congressional District. He will face Representative David Valadao, the Republican incumbent.
Any indication of tepid support for Graham Platner, a Democratic candidate for Senate in Maine, will be seen as a warning sign about his chances against Senator Susan Collins, the Republican incumbent.
Graham Platner, a Democratic candidate for Senate in Maine who is seeking to challenge Senator Susan Collins in the fall, has been mired in scandals in recent weeks.