An incumbent over 50 is solid. I'm skeptical of the campaign value of the Kavanaugh issue. It would make more sense to point out that the Supreme Court could overturn
Roe v. Wade after the election thanks in part to Collins, considering:
voters and found that although 63 percent of overall voters view Sen. Collins favorably, 68 percent want to see Roe v. Wade upheld, including 45 percent of Republicans (versus 35 percent who want the decision overturned).
https://mainebeacon.com/poll-mainers-overwhelmingly-support-upholding-roe-v-wade/