The $5 million investment from the main super PAC for Senate Democrats is a sign that party leaders see a path to winning in another red state as the political environment worsens for Republicans.

Slashing personal attacks dominated the first televised face-off between Dr. Abdul El-Sayed, the Democratic nominee for Senate, and former Representative Mike Rogers, his Republican rival.

In a top Senate battleground, Representative Ashley Hinson, the Republican nominee, sparred with Josh Turek, her Democratic rival, on policy issues ranging from Medicaid to term limits.

Representative Ashley Hinson, the Republican nominee, and Josh Turek, her Democratic opponent, have both been targeted over campaign donations.