Macron left the socialist party to form En Marche, after being Hollande’s economic minister. Le Pen is simply jettisoning her party baggage also.
Marine Le Pen Temporarily Steps Down as Front National Leader to Concentrate on Presidential Bid LINK
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Note the lack of emphasis on appealing to moderates. It explains it as a way to concentrate on the election.
The choice is between a young male Socialist and an older female Socialist. He’s better looking than she is and has a prettier wife about her age.