WASHINGTON — Democratic U.S. Rep. Elissa Slotkin brought in over $2.8 million for her Senate bid in the last fundraising quarter of 2023, ending the year with $6 million in the bank, her campaign said Tuesday. Slotkin, a three-term congresswoman from Holly, in total raised $11.7 million since jumping into the race in late February after U.S. Sen. Debbie Stabenow, D-Lansing, announced she wouldn’t seek another six-year term. Slotkin’s campaign said the haul is a record for a Senate candidate in Michigan in an off-election year, and that 11,000 new donors gave who had not previously contributed….