In the 2020 election, the majority of voters in Maine voted for Democratic presidential candidate Joe Biden. Wouldn't Biden supporters want to make it easier for him to enact his policies by having the Democrats control both the House (which they already did) and the Senate (which Republicans controlled)?
But the majority of voters in Maine voted for the re-election of Republican Senator Susan Collins. Maine is so far the only state in this election where the party that won the presidential vote did not also win the Senate seat. Have any reputable sources explained why this occurred?