The US Constitution forbids her using a foreign title of nobility to run for public office so NO she would not be able to call herself The Duchess of Sussex while running for office.
It will be interesting to see what name she plans to use in her US documents. So far I assume she is still Rachel Meghan Markle as she has not filed to change her legal name. She could become Rachel Meghan Mountbatten-Windsor, but I don't see why she would need to take her husband's name when she is already known "professionally" as "Meghan , The Duchess of Sussex".
I don't think she can use "The Duchess of Sussex" in any US document, but it is curious that the professional name she took in the US is similar to the legal name she had in the UK minus the HRH. I mean, on Archie's birth certificate , she was "Rachel Meghan, Her Royal Highness The Duchess of Sussex", without Markle or any family name.
Not quite. One would assume the good people of the USA would be able to choose their candidate based on their perception of her ability to serve the people. The royal connection only gets her extra visibility at the outset, the rest is up to her.
Meghan is not running for office, so I don't know why we are even discussing this.
In any case, she is eligible to be a senator as she is over 30, has been a citizen of the United States for more than 9 years and is a resident of the state which she would represent. Her royal connection, if anything, would probably be used against her in any campaign, so I think it is a liability more than an asset.
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