Back in Maine, Sen. Susan Collins (R-ME) - already in hot water for her decision to support Supreme Court Justice Brett Kavanaugh - is now seeing a prime Democratic rival, Maine House Speaker Sarah Gideon, zeroing in on her votes in the Trump impeachment trial.
While Collins is facing tough votes in the Trump trial, Gideon has been back in Maine firing away at the Maine Republican.
“Senator Collins voted with Mitch McConnell to block witnesses and evidence from the impeachment trial,” Gideon said.
"She (Collins) has proven that she has won tough races in the past, but this will be her most difficult re-election," said Nathan Gonzales, an elections analyst with Roll Call, told C-SPAN earlier this week.
Also getting involved in some of these races is former New York Mayor Michael Bloomberg, who is funneling some of ad money into Arizona, Colorado, North Carolina, and Maine.