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.

© Pool photo by Paul Sancya

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.

© Pool photo by Cody Scanlan

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

© KC McGinnis for The New York Times