CNN  —  Democrats have one big hope as they scramble to find a top-tier recruit against GOP Sen. Susan Collins in Maine: Maybe she won’t run at all. Collins, the lone New England Senate Republican, who is at the peak of her influence over 28 years in the chamber, has fended off one Democratic foe after another in hard-fought races to hang on to her seat. And again, her seat is pivotal in the Democrats’ uphill climb back to the majority. But Collins, 72, has yet to make a formal announcement