With control of Congress hanging in the balance, nominees have attacked their rivals’ records, stock portfolios and families, with varying degrees of accuracy.
From left, Representative Mike Collins, Republican of Georgia; Troy Jackson, the Democratic nominee for Senate in Maine; and Mike Rogers, the Republican Senate candidate in Michigan.
The race in Maine, which could decide Senate control, is testing whether there is still room for Ms. Collins’s brand of moderation during a sharply polarizing presidency.
Senator Susan Collins of Maine has cultivated a reputation as an independent-minded Republican who delivers for her state. As she seeks re-election, she faces a growing set of political challenges.